2. 外语
  3. The enemy forces lost no time in retreat______they should be cut off and surrounded.

The enemy forces lost no time in retreat______they should be cut off and surrounded.

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问题 The enemy forces lost no time in retreat______they should be cut off and surrounded.
选项 A、unless
B、lest
C、if
D、provided
答案B
解析 状语从句题。本题考查连词的用法。unless意为“除非……"；lest意为“唯恐……"；provided可用作连词，意为“如果"，和if同义。根据题意可知B正确。
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