单项选择题

A．when
B．until
C．since
D．while
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单项选择题
A．outB．atC．onD．up
A．out
B．at
C．on
D．up
单项选择题
What does the woman advise the man to do
[A] Approach the problem in a logical fashion.
B. Time how long it takes to solve the problem.
C. Be patient with the problem.
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