Not easy as the problem of pollution is____, no one should just stop trying.A．to_刷题宝

题干

Not easy as the problem of pollution is____, no one should just stop trying.

A．to solve

B．to be solve

C．solving

D．being solved

上一题下一题 0.85难度单项选择更新时间:2011-01-12 10:40:55

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