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
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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
单项选择题
Unless ______ by credit card, please pay in cash.
A. pay
B. is paid
C. paying
D. paid
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