单项选择题

The President of Harvard pioneered the elective system by ______ students were able to choose their own courses of study.

A．what
B．whom
C．that
D．which
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单项选择题
Though her parents dislike the young man, they can not prevent their daughter ______ marrying him.
A．to
B．in
C．from
D．for
单项选择题
Twenty-four members took part in the debate, most of them making speeches ______ to the chairman.
A．to oppose
B．be oppose
C．opposing
D．opposed
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