单项选择题

I ______ English for six years before I came to Beijing University.

A．learned
B．have learned
C．have been learning
D．had learned
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单项选择题
It is you ______ our real friend.
A．that is
B．which is
C．who is
D．who are
单项选择题
Dr. Smith insisted ______ for a month.
A．I resting
B．that I am resting
C．that I rest
D．me to rest
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