单项选择题

He ______ have been nervous because he didn’t go straight in.

A．ought to
B．must
C．should
D．had to
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单项选择题
Watch out, the boss is disgusted ______ your behavior!
A．to
B．at
C．for
D．with
单项选择题
He handled the company in ______ with his brother.
A．combination
B．mixture
C．collaboration
D．association
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