I was doing my homework I heard someone knocking at the door． [ ] A．while B．when C．unless D．if 题目和参考答案——青夏教育精英家教网—

题目内容

I was doing my homework ________ I heard someone knocking at the door．

[　　]

A．while

B．when

C．unless

D．if

答案：B

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