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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