单项选择题

This model is ______ to all the others on the market.

A．super
B．superior
C．beneficial
D．advantageous
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单项选择题
The staff, having finished work for the day, ______ going home now.
A．is
B．are
C．was
D．were
单项选择题
One reason for the successes of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.
A．pains
B．endeavours
C．efforts
D．attempts
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