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10. Temperatures  quite dramatically at night in mountains,so put on some warm clothes before going out.

A. are dropped       B. drop

C. are being dropped     D.  have dropped

 

10.   B考查动词的时态和语态。句意:山里的温度在晚上会急剧下降,所以出去前穿上暖和的衣服。此处用一般现在时, drop是不及物动词,没有被动语态。

题目来源:2015全品语法快练高中英语新课标 > 训练15 动词的时(语)态和主谓一致

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