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
This question is too hard, it is______my comprehension.
A. below
B. beyond
C. over
D. without
单项选择题
I suppose you are not serious, ______
A. do I
B. don't I
C. are you
D. aren't you
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