We wonder ___________ quite a number of living things are dying out.A．thatB．asC．_刷题宝

题干

We wonder ___________ quite a number of living things are dying out.

A．that

B．as

C．why

D．when

上一题下一题 0.64难度单项选择更新时间:2013-01-05 09:14:56

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