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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】

試題分析:考查狀語從句 句意上,既然你從沒有給他機會去嘗試你又怎么能期待他有改進呢?此句為讓步狀語從句,表示“既然”之意。A項“unless”通常引導的是條件狀語從句;C項的“until”引導的通常是時間狀語從句而D項的“while”在句中通常引導的是時間狀語從句;B項的“when”在句中則可以引導讓步狀語從句,表示“既然”之意故選B。

考點:考查狀語從句

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