I was writing a letter last night when I heard somebody____a

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I was writing a letter last night when I heard somebody____at the door. A. knocking B. knock
I was writing a letter last night when I heard somebody____at the door. A. knocking B. knock 请高手回答,半桶水的就别乱解释,以免误人子弟!
两个答案各占一半，听起来都有道理，这道题我放弃了，谢谢各位。

选A.
hear sb doing sth.这是固定用法.
hear sb do sth表示“听到某人做了某事”,hear sb doing sth.表示“听到某人正在做某事”
我昨晚正在写信时听到有人敲门
这个是个时间点,不是时间段
再问： hear sb do sth.也是固定用法，为啥不选B？
再答： hear sb. do------听到某人做了某事，事情已经结束 hear sb doing sth---听到某人正在做某事，事情正在发生我上面解释了，你看看

改错:I was just (falling sleep) last night (when) I (heard) a I was writing a letter when she called. I was writing a report last night; ________ I would not have I _________ my homework last night when I heard a loud knock while i was walking along the street last night,i heard a __ 根据句子的首字母填空 Last night,I heard a s________ noise and I was re ____ she came in,i was writing a letter A when B while C sin when i was lying in bad that night ,I‘ heard a strange sound My sister()a letter when I got home last night填什么 17.My sister _____ a letter when I got home last night. a,letter,was,just,i,now,writing怎么写 I was busy___for a test last night.