单项选择题

I’m afraid the envelopes must be delivered at once, （） the conference brochures won’t be mailed.

A．unless
B．in case
C．otherwise
D． yet

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单项选择题
All the professors and associated professors are （） to meet in the college room on Sunday.

A．required
B． responded
C． requested
D．demanded
单项选择题
Do you think it would be better to send out sale（）directly to prospective buyers

A．book
B．literature
C． manual
D．price
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