单项选择题

The project required ten years of diligent research．（）

A．hardworking
B．basic
C．social
D．scientific

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单项选择题

Her father was a quiet man with graceful manners．（）

A．polite
B．similar
C．usual
D．bad

单项选择题

12 The two banks have announced plans to merge next year．（）

A．combine
B．close
C．break
D．sell

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