单项选择题

If you know ______ , you will have a job. If you know why, you will be the boss.

A．how
B．when
C．what
D．if
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单项选择题
Apparently, they are ______ happy to hear of his successful escape from the prison.
A．more
B．more than
C．other than
D．rather than
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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