I was reading attentively in my own room suddenly he knocked at the door. A. when B. whil

发布时间：2020-08-16 14:31:47

I was reading attentively in my own room      suddenly he knocked at the door.

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

网友回答

(答案→)A. when
B. while
C. then
D. as
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