单项选择题

Sales went up in the stores during December, but ________ again after Christmas.

A. dropped off
B. dropped out
C. dropped over
D. dropped on
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单项选择题
The vocabulary and grammatical difference between British and American English are so trivial and few as hardly ________.
A. noticed
B. to be noticed
C. being noticed
D. to notice
单项选择题
Just as the soil is a part of the earth, ___________ the atmosphere.
A. as it is
B. the same is
C. so is
D. and so is
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