单项选择题

We work to make money,but it's a()that people who work hard and long often do not make the most money.

A. dilemma
B. conflict
C. prejudice
D. paradox

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单项选择题
The millions of calculations involved, had they been done by hand,()all practical value by the time they were finished.

A. had lost
B. would lose
C. would have lost
D. should have lost
单项选择题
You can't help but hear commercials; every few minutes the program is interrupted to give you one ad- vertising().

A. so on and so forth
B. more or less
C. something or other
D. sooner or later
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