单项选择题

If only I ______ how to operate a computer!

A．learn
B．would learn
C．have learned
D．had learned
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单项选择题
Jane turned pale ______ she saw him.
A．at the moment
B．the moment
C．for a moment
D．in a moment
单项选择题
Only under special circumstances ______ to take make-up tests.
A．are freshmen permitted
B．freshmen are permitted
C．permitted are freshmen
D．are permitted freshmen
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