I didn't know what--------then.A.he was doing B.was he doing C.he_英语解答

I didn't know what--------then.A.he was doing B.was he doing C.he is doing D.is he doing

人气：488 ℃　时间：2019-11-04 09:37:57

解答

A.he was doing 宾语从句,时态和主句保持一致,C时态不对；因为是从句,要用陈述句,B和D是特殊疑问句.