单项选择题

The lift is out of _________, so we'll have to walk upstairs.

A．function
B．running
C．order
D．work
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单项选择题
Professor Chang is always very _________ to the reaction of the andience when he gives lecture.
A．sensible
B．positive
C．sensitive
D．responsible
单项选择题
Anyone who wants to can call any timepiece a clock, but technically speaking, only _________. ones ring out the time actually deserve the name.
A．whichever
B．whatever
C．whenever
D．wherever
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