单项选择题

She has（）some brilliant scheme to double her income.

A. come out
B. come up with
C. come to
D. come about

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单项选择题
It is hard to tell whether we are going to have a boom in the economy or a （）

A. concession
B. recession
C. submission
D. transmission
单项选择题
Whenever work is being done, energy（）from one form into another.

A. converts
B. converted
C. is converted
D. is being converted
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