题目列表(包括答案和解析)
--- I dropped in at your house at about ten last night, but you weren’t in.
--- I ______ regular exercises at the club.
A. did B. was doing C. had done D. have been doing
-I dropped in at your house at about ten last night, but you weren't in.
-I ________ regular exercises at the club.
A.did
B.was doing
C.had done
D.have been doing
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