单项选择题

The problem ______ success is that by the time you are rich enough to sleep late, you are so old that you always wake up early.

A．of
B．on
C．with
D．for
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单项选择题
At the dinner held in his honor, Miller ______ a toast to the lasting friendship of his former classmates.
A．proposed
B．suggested
C．raised
D．forwarded
单项选择题
People who wait for all conditions to be perfect before acting, ______
A．never have acted
B．never acting
C．never to act
D．never act
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