单项选择题

Hello! You ______ be the assistant. I'm Mr. Munroe.

A．ought to
B．should
C．could
D．must
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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
单项选择题
My cousin Mary is often in a poisonous mood; I suppose it's because she is ______ child.
A．one
B．a unique
C．a single
D．an only
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