单项选择题

At the () of the bell, the students rushed into the classroom.

A．sight
B．noise
C．voice
D．sound

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单项选择题
--Are you still thinking about yesterday's game --Oh, that's ().

A．what makes me feel excited
B．whatever I feel excited about
C．how I feel about it
D．when I feel excited
单项选择题
I () have written to him because he phoned me shortly afterwards.

A．ought to
B．must
C．couldn't
D．needn't
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