中文谷－HowoftendoIneedtofeedthebird?－They
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问题详情：
－How often do I need to feed the bird?
－They ________ food every day，or they will be hungry.
A. must give B. mustn't give
C. must be given D. mustn't be give
【回答】
C
知识点：动词语态
题型：选择题
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