单项选择题

I have already put ______ necessary into my computer.

A．all the information
B．all of the informations
C．all the informations
D．all informations
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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
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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