Did you hear someone__door while you __TV last light Yes,I did,I opened the door but found nobody

Did you hear someone__door while you __TV last light Yes,I did,I opened the door but found nobody

题目
Did you hear someone__door while you __TV last light Yes,I did,I opened the door but found nobody
outside
Aknocking at was watching
Bknock at were watching
选C,为什么不选A,hear sb do sth 和doing都有啊
答案
you 要用were 啊!
很高兴为你解答!
老师祝你学习进步!
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