Nowadays certain limit should be set on use of cars to reduce air pollutio_刷题宝

题干

Nowadays certain limit should be set on use of cars to reduce air pollution.

A．/; the

B．a; the

C．the; /

D．the; the

上一题下一题 0.85难度单项选择更新时间:2013-09-09 06:17:36

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