For a long while he waited, not daring to descend from his hiding place ______ t

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问题 For a long while he waited, not daring to descend from his hiding place ______ they should come out and catch him in the act.

选项 A、when
B、lest
C、that
D、where

答案 B

解析题干主句的时态是一般过去时，而从句谓语动词是“should十动词原形”，由此可以判断所填词应引导一个虚拟语气句，而四个选项中只有lest可以引导虚拟语气句，故[B]为答案。

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