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

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

admin2009-09-17  47
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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