单项选择题

Mr. Morton gradually ______ a knowledge of the subject.

A．attained
B．required
C．acquired
D．enquired
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单项选择题
Many of the students have a grasp of the main structures, a reasonable vocabulary and a(n) ______ idea of how to pronounce most words they come across.
A．faint
B．vague
C．obscure
D．rough
单项选择题
Advertising costs are no longer in reasonable ______ to total cost of the product.
A．relationship
B．match
C．measure
D．proportion
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