单项选择题

He ______ another career but, at the time, he didn't have enough money to attend graduate school.

A．might have chosen
B．might choose
C．had to choose
D．must have chosen
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单项选择题
Some scientists are dubious of the claim that organisms ______ with age as an inevitable outcome of living.
A．depress
B．default
C．deteriorate
D．degrade
单项选择题
California has more light than it knows ______ to do with but everything else is expensive.
A．how
B．what
C．which
D．where
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