【題目】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:藥品必須被保存在干燥低溫的地方。句子中medicinekeep之間是被動關(guān)系,這里含有情態(tài)動詞must,所以應(yīng)該是含有情態(tài)動詞的被動語態(tài),由must be+動詞的過去分詞構(gòu)成。故答案選D。

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