单项选择题

62（）

A．she discovered
B．did she discover
C．she did discover
D．does she discover

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单项选择题
61（）

A．the number of
B．the amount of
C．an amount of
D．a number of
单项选择题
Salesmanship refers to the ability to ______ people to willingly buy products.
A．persuade
B．force
C．cause
D．recommend
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