单项选择题

Jack wishes that he （） business instead of history when he was in university.

A. studied
B. study
C. had been studying
D. had studied

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单项选择题
I shall tell you what he （） at three o’clock yesterday afternoon.

A. was doing
B. did
C. had been doing
D. has done
单项选择题
（） the claim about German economic might, it is somewhat surprising how relatively small the German economy actually is.

A. To give
B. Given
C. Giving
D. Having given
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