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3.        him or her leave a message in case anyone happens to drop in while I am out.(  )
A.GetB.HaveC.AskD.Where

分析 万一有人碰巧在我不在时来这里,让他或她留言.

解答 答案:B
题干中in case anyone happens to drop in while I am out是一个条件状语从句;说明前面是主从复合句中的主句,不能用连词引导,可排除D项;get/ask sb to do sth让某人做某事,后接不定式;have表示让某人做某事,是使役动词,后接动词原形.故选B.

点评 祈使句通常以动词原形开头,其否定结构是直接加don't来构成.表示命令,建议,请求等.

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