He took his umbrella with him lest it ________ (rain).
【正确答案】：should rain/rain
【题目解析】：本题考查lest的虚拟语气。在一般情况下，lest 所引导的从句中，谓语动词要用虚拟语气，即 “ (should+) 动词原形”。
He took his umbrella with him lest it ________ (rain).
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