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

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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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