单项选择题

I'm not surprised you failed the exam. You ______ have worked harder.

A．should
B．must
C．would
D．ought
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单项选择题
No students ever touched him ______ they respected him.
A．for
B．but
C．nor
D．so
单项选择题
My brother likes to play football; be is really enthusiastic ______ it.
A．for
B．with
C．at
D．about
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