单项选择题

He has been asked to account ______ his absence.

A. for
B. on
C. of
D. about
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单项选择题
He finished ______ in the 1,500-meter run.
A. champion
B. championship
C. first
D. No. one
单项选择题
A man has to make ______ for his old age by putting aside enough money to live on when old.
A. supply
B. assurance
C. provision
D. adjustment
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