单项选择题

A good writing ______ clear organization and choices of words.

A．calls on
B．calls for
C．calls up
D．calls off
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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
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
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