题目内容

This kind of medicine ________in a dry and cool place。
A．keepB．keptC．must keepD．must be kept
D

试题分析：句意：这种药必须保存在干燥凉爽的地方。结合语境可知本句主语是动作对象，故用被动语态，故选D。
点评：此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态，反之如果是动宾关系，则用被动语态。注意一些接不带to的不定式做宾语补足语的动词用作被动语态时，不定式符号to要加上。
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