单项选择题

Some criminal slang is so highly developed that pickpockets, for example, can ______ a conversation in front of a victim without the person's realizing that they are discussing.

A．carry on
B．carry away
C．carry out
D．carry off
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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
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
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