单项选择题

I ______ English ever since I came here in the United States three years ago.

A．am learning
B．was learning
C．have been learning
D．have learned
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单项选择题
It is hot outside. I'd rather you ______ the room.
A．not leave
B．don't leave
C．won't leave
D．didn't leave
单项选择题
It is reported that the police ______ the case.
A．is looking on
B．are looking into
C．is looking after
D．are looking up
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