单项选择题

The professor ______ to America and he will give us a talk after he comes back.

A．has gone
B．has been
C．went
D．was going
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单项选择题
The house has belonged ______ her family for three or four generations.
A．to
B．with
C．by
D．in
单项选择题
That is my dictionary, ______ cover is red in color.
A．whose
B．which
C．that
D．what
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