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Is Lucy knocking at the door?No.It _____ be Lucy.She is in Japan now.

分类: 作业答案 • 2021-12-19 21:25:03

问题描述：

Is Lucy knocking at the door?No.It _____ be Lucy.She is in Japan now.

答

can'twhycan'tbe肯定不是，表示推测，是must be的否定。