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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:考查连词:A.unless 除非,B.when当…时候,既然,如果,C.until直到,D.while即使,虽然,然而,当…时候,句意:既然你不从来不给他任何机会去尝试,你又怎么能够知道他不会有任何的进步呢?选B。
考点:考查连词

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