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

I'd rather you（）anything about it for the time being.

A．do
B．didn't do
C．don't do
D．didn't

单项选择题

When he returned home, he found the window open and something（）

A．to steal
B．stealing
C．stole
D．stolen

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