单项选择题

The people at the party were worried about Susan because no one was aware______ she had gone.

A．where that
B．of where
C．the place where
D．the place
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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
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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