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【单选题】

We should urge people riding in cars.
[ ]

A.
stop
B.
stopping
C.
to stop
D.
stopped
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参考解析:
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举一反三

【单选题】It ’s our duty to_________people_________too many trees.

A.
stop; cutting down
B.
prevent, to cut down
C.
keep; cutting down
D.
make; cut down

【单选题】— Go and ask the waiter how much _____. — Don't worry. It has been _____. [ ]

A.
does the meal cost, paid for
B.
the meal costs, paid
C.
the meal spends, paid
D.
the meal costs, paid for