单项选择题

It's natural that she （）do so.

A. should
B. will
C. could
D. must

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

A. have
B. have been
C. has
D. has been
单项选择题
It was your brother（）I met at the station.

A. who
B. whom
C. that
D. why
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