When you at the door, I some washing.A、knocked; didB、was knowcking; didC、k

When you ______ at the door, I ______ some washing.

A、knocked; did

B、was knowcking; did

C、knocked; was doing

D、knock; am doing

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When you ______ at the door, I ______ some washing.A、knocked; didB、was knowcking; didC、k