单项选择题

Mr. Morgan gradually_________ a knowledge of the subject.

A．attained
B．required
C．acquired
D．enquired
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单项选择题
Michelle found it difficult to get his British jokes _________ to Australian audiences.
A．across
B．deal
C．over
D．down
单项选择题
During the summer vacation, Mary worked on a (an) _________ basis as a salesman, taking 8 percent of everything she sells.
A．salary
B．income
C．commission
D．pension
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