27. People have become aware the fact that carbon dioxide, poison to the environment, cont

发布时间：2020-08-16 06:47:21


27. People have bee aware     the fact that carbon dioxide, poison to the environment, contributes     air pollution.
A. of, to
B. /, to
C. of, of
D. of, for

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(答案→)A. of, to
B. /, to
C. of, of
D. of, for
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