题目内容
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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| A．whom | B．whose | C．who | D．that |
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| A．unless | B．before | C．whether | D．while |
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| A．as | B．that | C．which | D．where |
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| A．which | B．that | C．whose | D．when |
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| A．although | B．because | C．so | D．if |