题目内容

The flowers ________ every day, or they will die.
A．must waterB．can be watered
C．should waterD．must be watered
D

试题分析：此题重点考查被动语态，由于主语是动作的承受者，该句要用被动语态，排除A、C；根据句意：“每天一定要浇花，否则他们会死掉”B答案语气太委婉，因此要用must be+过去分词，故选D
点评：该题考查被动语态，做题时首先分析题干的主语是动作的执行者还是动作的承受者，若是动作的承受者就要用被动语态，特别要主语被动语态的结构，be+动词的过去分词
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