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
I can understand their eagerness that you ______ the main speaker.
A. be
B. shall be
C. are to be
D. must be
单项选择题
Retirement is obviously a very complex ______ period; and the earlier you start planning for it, the better.
A. transition
B. transaction
C. transmission
D. transformation
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