【題目】The birds ________ water every day, or they’ll be thirsty.

A. must be given B. must give

C. mustn’t give D. mustn’t be given

【答案】A

【解析】句意:這些鳥必須每天喝水,否則它們會口渴。主語The birds與所提供的動詞之間是被動的關(guān)系,因此本句是含有情態(tài)動詞的被動語態(tài),其構(gòu)成為:情態(tài)動詞+be+及物動詞的過去分詞,排除B,C;結(jié)合語境理解,只有給鳥水喝,才能不渴,故答案為A。

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