单项选择题

He has been interested in computer since his childhood, so he specialized（）computer science when he was in college.

A．on
B．at
C．for
D．in

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单项选择题
The easier the problems are,（）able to solve them.

A．I am less likely
B．less likely I am
C．the less likely I am
D．the less likely am I
单项选择题
It was not until he had arrived home（）he remembered his appointment with the lawyer.

A．that
B．where
C．when
D．which
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