IsthatTomunderthetree?--------It_____beTom.TomisonholidayinBeijingnow.是can't还是mustn't
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题目内容：
Is that Tom under the tree?--------It_____be Tom .Tom is on holiday in
Beijing now.
是can't 还是mustn't
优质解答
can't
问：树下的那个人是汤姆吗?
答：不可能是汤姆,汤姆正在北京度假呢.
此处应填否定回答 can't be
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