单项选择题

Some cities have passed laws that allow coal and oil()only if their sulfur content is low.

A. burning
B. to burn
C. being burned
D. to be burned

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单项选择题
Soon he got () his difficulties and succeeded.

A. across
B. away
C. over
D. through
单项选择题
You () able to speak English so well if you hadn't been practising hard.

A. are not
B. can not be
C. wouldn't be
D. would have been
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