单项选择题

There is a(n) ______ that I'll be elected as the chairman of the student union.

A．chance
B．opportunity
C．case
D．occasion
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单项选择题
This lamp is too far from the outlet. You may need an extensive ______.
A．wire
B．cord
C．string
D．rope
单项选择题
We were too tired to go on with our work, ______ we had a break.
A．accordingly
B．conversely
C．primarily
D．frequently
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