Question

It's high time that we students ______ even harder at our lessons as the national entrance examination is coming nearer.

A．work

B．will work

C．worked

D．have to work

Answer 1

C

解析试题分析：It’s high time that +…should do/did+其它 “是做…关键时候了”。That从句中要用虚拟语气，特别注意should不可省。故选C.句意：随着高考的临近，是我们学生更加努力学习的关键时候了。
考点：虚拟语气
点评：虚拟语气是高考必考点，用法较多，现将特殊的虚拟语气结构介绍如下：
（1）虚拟语气用在状语从句中由as if 或as though引导的状语从句表示比较或方式时，从句中的谓语动词用虚拟语气。动词形式用动词的过去式(be→were)或had+过去分词。
如： The teacher treats the student as if he were her own child.
这位老师带这位学生就象她的亲生孩子一样。
He speaks as if he had been to the United States.他说得好象他真的到过美国似的。
（2）在It is time (that) …; I’d rather(that)…句型中从句的谓语动词常用动词的过去式表示虚拟语气，意思是“该干某事了，时间已经有些晚了”“我宁愿/希望”。
如： It is time that we did something to stop pollution.该我们做些什么制止污染的时候了。
It is time that Father picked up Lily from the kindergarten.该父亲去幼儿园接莉莉的时候了。
I’d rather you told me the truth.我真希望你告诉我真相。
I’d rather I didn’t see you again.我宁愿不再见着你。