单项选择题

Will you show me the boy（）mother is working in our department

A．his
B．who
C．whose
D．that

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单项选择题
We have four computers in our office but（）of them are in good order.

A．all
B．none
C．one
D．both
单项选择题
I called Tom at his office, but the voice （） answered the phone was not his.

A．who
B．whom
C．which
D．when
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