单项选择题

______ your work in case you've made any mistakes.

A．Take care of
B．Ensure
C．Look out for
D．Check
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单项选择题
We were ______ for an hour in the traffic and so we arrived late.
A．kept off
B．held up
C．put back
D．broken down
单项选择题
A severe flood struck the city and there was a ______ shortage of food.
A．frequent
B．consequent
C．consecutive
D．consequential
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