单项选择题

Today children （） everywhere in China.

A. take good care of
B. have taken good care of
C. had been taken good care of
D. are being taken good care of

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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
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
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