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He must be in the building because he was seen()the building just now. A.enter B.to enteC.enteringD

分类: 作业答案 • 2022-07-05 19:25:08

问题描述：

He must be in the building because he was seen()the building just now. A.enter B.to enteC.enteringD

答

B see sb do something 变被动态时要加to

答

to enter