单项选择题

A doctor, together with two nurses,（）sent to the mountain village.

A. have
B. have been
C. has
D. has been

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单项选择题
It was your brother（）I met at the station.

A. who
B. whom
C. that
D. why
单项选择题
Not until quite recently （） he gave up his plan to go abroad.

A. I knew
B. I had known
C. did I know
D. I did know
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