20、I was about to go to bed ____ suddenly someone knocked at the door.

A. while         B. since            C. when           D. then

20、C

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科目：高中英語 來源： 題型：

I was about to go to bed ____ suddenly someone knocked at the door.

A. while         B. since            C. when           D. then

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科目：高中英語 來源：合肥市第七中學2009屆高三第五次月考英語試卷(最新題型) 題型：014

I was about to go to bed ________ suddenly someone knocked at the door．

[　　]

A．while

B．since

C．when

D．then

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