What___you___when someone knocked at the door?A.did;do B.were;doing C.do;do D.are;doing什么时候用was/were doing,什么时候用did

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What___you___when he came in? What___you___when someone knocked at the door?A.did;do B.were;doing C.do;do D.are;doing什么时候用was/were doing,什么时候用did so so so so so so so, So SO so so So... so So so so