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
When he tried to make a ______ , he found that the hotel was completely filled because of a convention.
A．reservation
B．claim
C．mess
D．revision
单项选择题
Advanced computer technology has ______ an answer to accurate weather forecasting.
A．set up
B．come up with
C．filled in
D．faced up to
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