—How often do I need to feed the fish?
－They      food every day, or they will be hungry.
A．must giveB．mustn’t giveC．mustn’t be give.D．must be given
D

試題分析：句意：你多久喂一次魚(yú)？他們每天都必須被喂食，否則他們會(huì)餓。主語(yǔ)they指魚(yú)，是動(dòng)作的承受者，故用被動(dòng)結(jié)構(gòu)：be + done,含有情態(tài)動(dòng)詞的被動(dòng)結(jié)構(gòu)：情態(tài)動(dòng)詞+ be + done，結(jié)合句意及句子結(jié)構(gòu)，故選D
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