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【题目】The medicine in a dry and cool place.

A. keep B. must keep C. must be keep D. must be kept

【答案】D

【解析】

句意:药品必须被保存在干燥低温的地方。句子中medicinekeep之间是被动关系,这里含有情态动词must,所以应该是含有情态动词的被动语态,由must be+动词的过去分词构成。故答案选D。

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