题目内容
I first met Mr. Smith in
A. studied B. had studied C. is studying D. was studying
D
解析:本句选用过去进行时,指那时动作正在发生。

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题目内容
I first met Mr. Smith in
A. studied B. had studied C. is studying D. was studying
D
解析:本句选用过去进行时,指那时动作正在发生。