问题

There is a widespread belief among the science world we keep on _ the earth as we are doing today, the exist ence of us humans on this planet will be out of the question in some years yet to come.[ ]

A: if; polluting
B: if; to pollute
C: that if; to pollute
D: that if; polluting

正确答案是：

同类题型

__________ he is old, the old man still insists on studying at a night school

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Excuse me, sir．But your bike gets the way of my car.— Sorry．I didn’t see your car.

______,I realized what I’d said,but it was too late [ ]