We should think hard ________ human activity has caused greenhouse effect.A．it i_刷题宝

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We should think hard ________ human activity has caused greenhouse effect.

A．it is how that	B．how it is that
C．that how is it	D．how is it that

上一题下一题 0.64难度单项选择更新时间:2015-09-10 03:02:46

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