Question

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

Answer 1

 

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。