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How can you expect him to make any improvement ________you never give him an opportunity to have a try?

A. unless B. when C. until D. while

B

【解析】

试题分析:考查状语从句 句意上,既然你从没有给他机会去尝试你又怎么能期待他有改进呢?此句为让步状语从句,表示“既然”之意。A项“unless”通常引导的是条件状语从句;C项的“until”引导的通常是时间状语从句而D项的“while”在句中通常引导的是时间状语从句;B项的“when”在句中则可以引导让步状语从句,表示“既然”之意故选B。

考点:考查状语从句

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