单项选择题

Business in this area has been () because prices are too high.

A．prosperous
B．secretive
C．slack
D．shrill

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单项选择题
He added a () to his letter by saying that he would arrive before 8 pm.

A．presidency
B．prestige
C．postscript
D．preliminary
单项选择题
All our attempts to ()the child from drowning were in vain.

A．regain
B．recover
C．reserve
D．rescue
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