单项选择题

Dumped waste might contaminate water supplies.

A．destroy
B．decrease
C．delay
D．pollute
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单项选择题
Doctors strongly recommend that fathers should be present at their baby's birth.
A．comment
B．request
C．suggest
D．demand
单项选择题
Our plan is to allocate one member of staff to handle appointments.
A．assign
B．persuade
C．ask
D．order
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