问题

How can you expect him to make any progress ________ you never give him a chance to have a try?

A:when
B:unless
C:even though
D:until

正确答案是：

同类题型

下列各句中，加横线的成语使用恰当的一项是（）

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If you don’t know a word, you may ______ in a dictionary.

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