单项选择题

All ______ live must die.

A．which
B．who
C．that
D．whom
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单项选择题
His homework ______, Bob decided to go and see the film.
A．done
B．was done
C．had been done
D．did
单项选择题
Long ______ to harmful pollutants is most likely to lead to a decline in health.
A．exposure
B．contact
C．use
D．touch
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