单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Take a break.
B．Go to work.
C．Do the other problems.
D．Keep trying.
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单项选择题
A．itsB．hisC．theirD．our
A．its
B．his
C．their
D．our
单项选择题
A．thereforeB．sinceC．furthermoreD．forever
A．therefore
B．since
C．furthermore
D．forever
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