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【题目】— Too much homework has made me tired these days, Miss Wang.

—That’s true. But a small tree won’t grow into a big tree________ it experiences lots of winds and rains.

A.ifB.becauseC.whenD.unless

【答案】D

【解析】

句意:——王老师,这些天作业太多了,我都累了。——确实。但是一棵小树不会成长为一棵大树,除非它经历了很多风雨。

考查连词辨析。if如果(引导条件状语从句);because因为(引导原因状语从句);when当……时(引导时间状语从句);unless除非(引导条件状语从句)。分析句子可知,此处表示“但是一棵小树不会成长为一棵大树,除非它经历了很多风雨”的含义,强调“除非”,用于句中引导条件状语从句。故选D

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