单项选择题

Prisons in some countries are short of staff, ______ means each prison officer is overworked and underpaid.

A．which
B．this
C．that
D．what
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单项选择题
Had you listened to the doctor, you ______ all right now.
A．are
B．were
C．would be
D．would have been
单项选择题
The house needs ______, so we have to wait until Sunday to move in.
A．cleaning
B．be cleaned
C．clean
D．being cleaned
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