单项选择题

As a salesman, he works on a______ basis, taking 10% of everything lie sells.

A．revenue
B．commission
C．salary
D．pension
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单项选择题
The Lewis and Clark expedition ______the ten Story of the Louisiana Purchase and beyond as far as the Pacific Ocean.
A．located
B．searched
C．exploited
D．developed
单项选择题
He swallows his words so much that I can never ______what he is saying.
A．make out
B．put up
C．deal with
D．take up
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