单项选择题

As a salesman, he works on a (an)______basis, taking 10% of everything he sells.

A．income
B．commission
C．salary
D．pension
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单项选择题
We must______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
单项选择题
______it is you' re found, you must give it back to the person it belongs to.
A．That
B．Because
C．Whatever
D．However
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