单项选择题

We have four computers in our office but ______ of them are in good order.

A．all
B．one
C．none
D．both
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单项选择题
Will you show me the boy ______ mother is working in our department
A．his
B．whose
C．who
D．that
单项选择题
So far, how many volumes of the book have been published
A．Five.
B．Three.
C．Four.
D．None.
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