While I ___ a novel,someone ___at the door.A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking为什么?

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While I ___ a novel,someone ___at the door.A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking为什么?
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While I ___ a novel,someone ___at the door.A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking为什么?
While I ___ a novel,someone ___at the door.
A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking
为什么?

While I ___ a novel,someone ___at the door.A.read,was knockingB.read ,knockedC.was reading,knockedD.was reading,was knocking为什么?
D
当我正在读小说时,某个人在敲门
while后一般接进行时,这样后面就应该用过去进行时