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

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

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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 题干前一分句中的时态是一般过去时，而后一分句谓语动词是should+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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