单项选择题

______ is quite difficult for Mary to pass the interview.

A．What
B．This
C．That
D．It
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单项选择题
The villagers have offered much help to us and we think we should do something for them ______.
A．in return
B．in place
C．in fashion
D．in danger
单项选择题
We all think that John is the only candidate ______ will get the job.
A．who
B．whose
C．whom
D．whoever
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