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
Sometimes we are asked ______ we think the likely result of an action will be.
A．that
B．what
C．if
D．whether
单项选择题
Our singing group is going to give a ______ performance next Wednesday. Don't miss it!
A．live
B．living
C．lively
D．lovely
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