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
Since it is too late to change my mind now, I am______ to carrying out the plan.
A．obliged
B．committed
C．engaged
D．resolved
单项选择题
As a ______actor, he can perform, sing, dance and play several kinds of musical instruments.
A．flexible
B．versatile
C．sophisticated
D．productive
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