【題目】—How often do I need to feed the birds?
—They food everyday,or they will be hungry.
A.must give
B.mustn't give
C.must be given

【答案】C
【解析】句意:—我需要多久喂一次這些鳥?-他們必須每天被給食物,否則他們會餓的。must give必須給;mustn't千萬不要給;must be given必須被給。根據(jù)句意可知,句中的主語They代指的是the birds,它和動詞give構成被動關系,因此這里應填被動語態(tài),故選C。

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