单项选择题

______ I sympathize, I can't really do very much to help them out of the difficulties.

A. As
B. Whether
C. While
D. Now that

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单项选择题

The serious environmental problem exist nowadays, because adequate measures for preventing them ______ taken in the past.

A. was not
B. were not
C. were not being
D. being not

单项选择题

I could not persuade him to accept it, ______ make him see the importance of it.

A. if only I could not
B. no more than I could
C. or I could not
D. nor could I

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