【題目】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

【答案】B

【解析】

試題分析：考查動詞的時態(tài)和語態(tài)。句意：夜間山里的溫度急劇下降，因此一定要穿上暖和的衣服再出去。該句描述一種經(jīng)常發(fā)生的情況，故用一般現(xiàn)在時，故選B。

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