单项选择题

What is important in people’s lives（）

A．The earth.
B．Birds.
C．Scientists.
D．The natur

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单项选择题
It's natural that she （）do so.

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