单项选择题

In recent years special attention has been paid ______ developing the students' productive skills.

A．over
B．to
C．on
D．in
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单项选择题
I wish I ______ longer this morning, but I had to get up and come to class.
A．could have slept
B．slept
C．might have slept
D．have slept
单项选择题
The locals, all of whose homes ______ by the flood, received help from the Red Cross.
A．damaged
B．had been damaged
C．damaging
D．to damage
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