单项选择题

The staff, having finished work for the day, ______ going home now.

A．is
B．are
C．was
D．were
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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
单项选择题
The old farmer was run down by a car. He was taken to the hospital and ______ on by the chief surgeon right now.
A．operated
B．having been operated
C．is operated
D．is being operated
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