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
As teachers we should concern ourselves with what is said, not what we think______.
A．ought to be said
B．must say
C．have to be said
D．need to say
单项选择题
We must______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
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