-I went to your house at about ten last night, but you weren't in.-I regular
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—I went to your house at about ten last night, but you weren't in.
—I ________ regular exercises at the club.
A.did
B.had done
C.was doing
D.had been doing
试题答案
C
用过去进行时表示“昨晚10时你去的时候”“我”正在做什么。