单项选择题

They hung______at home waiting for a phone call and consequently missed the train.

A. up
B. back
C. about
D. down
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单项选择题
I cut my finger on a rusty tin and it became badly______.
A. infected
B. affected
C. effected
D. diseased
单项选择题
The ______of marriage is still popular despite the high divorce rate.
A. institution
B. debate
C. institute
D. university
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