18.The medicine _______ in a dry and cool place.( 。
A.must keptB.must keepC.must be keptD.must be keep

分析 藥品必須被保存在干燥低溫的地方.

解答 答案:C.
根據(jù)The medicine _______ in a dry and cool place,可知藥品必須被保存在干燥低溫的地方,句子中medicine和keep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.故選C.

點評 本題考查了情態(tài)動詞的用法.解答時注意句意以及所給選項的意思并作出正確選擇.

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