He ______ busy yesterday, or he ______ you with your experiment.
| A．was; had helped | B．was, would have helped |
| C．had been; would have | D．were; would have helped |
B
解析试题分析：考查时态和虚拟语气；第一空的时间状语是yesterday，故使用一般过去时。因为有含蓄的条件，用or(否则，要不然)，第二空是一个与过去事实相反的虚拟语气，使用“情态动词+have done”的形式；句意：昨天他很忙，要不然，他就会帮助你做实验。故B正确。
考点：考查时态和虚拟语气
点评：条件句中的虚拟语气；如果过去事实相反，条件句中使用过去完成时，主句使用“情态动词+have done”;如果主句与现在事实相反，条件句中使用过去时，be动词使用were,主句中使用“情态动词+动词原形”；如果与将来事实相反，条件句中有三种：过去时；were to do ;should+动词原形，主句使用“情态动词+动词原形”；要特别注意如果省略了if，句子要使用部分倒装的形式，把助动词，be动词，情态动词提之主语前。
阳光课堂课时优化作业系列答案科目：高中英语 来源： 题型：阅读理解
The kite was originally called Zhiyuan in North China, and Yaozi in South China. Early in the Five dynasties, a man named Li Ye used to make and fly a kite in the emperor's court. He once attached a whistle made of bamboo to the kite. Sound was let out when the kite was flying. The kite was named after Zheng, a kind of Chinese music instrument. Then it was named Fengzheng in Chinese.
The earliest kite in the world was made by Motse, a famous Chinese philosopher, who lived 2,300 years ago, for military (军事的) purposes. He spent three years making an eagle and managed to fly it. The eagle was later regarded as the first kite in the world. Kite-flying became a recreation probably from the Tang dynasty when the royal family and people of the highest class were addicted to it. It was said that the Emperor Xuanzong in the Tang dynasty once was interested in a kite named Eight Immortals Crossing the Sea flying in the air. Later, the paper-made kite was invented, which cost less and spread quickly among the common people. As time went on, kites flew to various countries in the world. 'The well-known British scientist, Dr. Needham, once described kites as an important scientific invention which spread to Europe from China in his book, A History of China's Science and Technology. The invention of the kite inspired men’s dream of flying and led to the invention of the airplane.
67. The kite made by Li Ye was named after a Chinese music instrument because __________ .
A. it was made of bamboo B. it could sound in the sky
C. Li Ye was a musician D. it looked like a whistle
68. What led to the invention of the kite according to the passage?
A. Wars. B. An eagle.
C. Motse's interest in animals.
D. Motse's dream of flying.
69. Why was kite-flying not a popular recreation among common people at first?
A. Because they were too busy to fly kites.
B. Because they were not allowed to fly kites.
C. Because it was difficult to make kites.
D. Because it was expensive to make kites.
70. Which of the following statements might Dr. Needham agree with?
A. The Chinese people first tried to invent airplanes.
B. The Chinese spread the idea of flying to Europe.
C. The invention of kites in China is great.
D. The invention of kites achieved the dream to fly.
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