题目内容

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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Mary caught last week, and she is suffering from now.

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B. bad cold; pneumonia
C. a bad cold; pneumonia
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A. as it is
B. the same is
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A. 16kbps
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I, ________ , do not believe that the era of the pioneer is at an end; I only believe that the area for pioneering has changed.

A. for one's part
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