I was listening to the radio ______. I heard a knock at the door.A、whileB、when

游客2025-07-01 5

问题 I was listening to the radio ______. I heard a knock at the door.

选项 A、while
B、when
C、as

答案 B

解析此题考查连词。本句意为：我正在听收音机，就在这时有人敲门。when意为就在那时，相当于at that time。

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Iwaslisteningtothemusic______therewasaknockatthedoor.A、whenB、while