【題目】The flowers often.
A.must be water
B.must be watered
C.must watered

【答案】B
【解析】句意:這些花必須經(jīng)常被澆水。含有情態(tài)動詞被動語態(tài)的結(jié)構(gòu)是情態(tài)動詞+be done,故選B。

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