单项选择。—Who'ssinginginthegarden?—It
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问题详情:
单项选择。
—Who's singing in the garden?
—It ________ be Mr. Brown. He always practices singing at this time.
A. must B. can't C. need D. mustn't
【回答】
A
知识点:情态动词
题型:选择题
标签:
单项
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