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the room, a flower pot was seen by the side of the window.A.Having enteredB.On e

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the room, a flower pot was seen by the side of the window.A.Having enteredB.On e

________ the room, a flower pot was seen by the side of the window.

A.Having entered

B.On entering

C.When entering

D.When I entered

试题答案

D

导解:主句的主语不能进行这一动作.