_____ is known to all is that effective measures should be taken to deal with th

题干

_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.

A．What

B．It

C．As

D．Which

上一题下一题 0.65难度单项选择更新时间:2013-09-23 09:37:41

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