单项选择题

You ______ her at the beginning, but now it is too late.

A．ought to refuse
B．have ought to refuse
C．ought to have refused
D．ought have refused
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He was a man of noble ______. He came from an old and prominent family in Virgini
A． sourceB. rootC. resourceD. origin
单项选择题
Every field of chemistry ______ different chemical reactions.
A．holds
B．consists
C．composes
D．involves
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