单项选择题
Prisons in the country are short of staff, ______ means prison officers are overworked and underpaid.
- A．where
B．who
C．which
D．when
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I don’t understand ______ he should have done something like that.
A．why
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They took ______ measures to prevent poisonous gases from escaping in the chemical plant.
A．influential
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They haven’t decided ______ the microscope themselves or buy one from the United States.
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