题目内容
When you ______ at the door, I ______ some washing.
[ ]
A.knocked, did B.was knocking, did
C.knocked, was doing D.knocked, am doing
答案:C
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题目内容
When you ______ at the door, I ______ some washing.
[ ]
A.knocked, did B.was knocking, did
C.knocked, was doing D.knocked, am doing