单项选择题
Frank's lessons were too hard for him, and he soon fell______the rest of the class.
A.behind
B.down
C.off
D.away from
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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
It is time to______fields in which they are just as capable as men.
A.keep women's
B.stop to keep women out
C.keep women away
D.stop keeping women out of
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