单项选择题

I have received ______ professional training.

A．three-month
B．three-months
C．a three-month
D．three-month’s
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单项选择题
I think your sister is old enough to know ______ to spend all her money on fancy goods.
A．better than
B．than
C．other than
D．rather than
单项选择题
In addition to setting the price of a product, business firms must decide ______ to offer special discount and credit terms to their customers.
A．if
B．which
C．whatever
D．whether
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