单项选择题

Rubber differs from plastics______it is produced naturally.

A. at that
B. in that
C. for that
D. with that
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单项选择题
The doctor will not perform the operation______it is absolutely necessary.
A. so
B. if
C. for
D. unless
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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