单项选择题

()we can get rid of poUution is still a big problem.

A. Whether
B. If
C. that
D. what

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单项选择题

I don't doubt () he'll come.

A. that
B. if
C. what
D. whether

单项选择题

When they had finished playing, the children were made to () all the toys they had taken out.

A. put out
B. put off
C. put up
D. put away

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