—How often do I need to feed the birds? —They ________ food every day，or they will be hungry. A. mus...
2023-02-25 22:31:18 169次 2011年广东省中考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
—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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