单项选择题

We hadn't enough money to pay our bus fare, and ______ we had to walk.

A．nevertheless
B．therefore
C．however
D．instead
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单项选择题
Be on your ______ against thieves while you are in the crowd.
A．watch
B．move
C．point
D．guard
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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