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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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
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
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