5.( 2011 浙江台州中考) 一How often do I need to feed the birds? —They food every day or they will be hungry. A. must give B. mustn’t give C. must be given D. mustn’t be given
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【答案】 5. C由“否则它们会饿”可推知or前一分句意思为“它们必须 每天都被喂食”，主语They是谓语动词表示的动作“喂食”的 承受者 应用被动语态，故选C.