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．what
D．it
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单项选择题
Had he been given some information, he ______ the questions.
A．answered
B．could have answered
C．answers
D．was answering
单项选择题
Agriculture is the country's chief source of wealth, wheat ______ by far the biggest cereal crop.
A．is
B．been
C．be
D．being
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