单项选择题

The course normally attracts 50 students per year, ______ up to half are from overseas.

A．of them
B．of whom
C．of those
D．of which
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单项选择题
We don’t really know who broke ______ Tommy’s house last night.
A．out
B．down
C．into
D．through
单项选择题
John is an excellent boss ______ he is looked up to by all of his employees.
A．but
B．and
C．while
D．or
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