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
（）put down the receiver when the telephone rang again.

A．Scarcely did she
B．Scarcely had she
C．Scarcely she
D．Scarcely she had
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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