单项选择题

They were invited to an important ball ______ the first time in their life.

A.for
B.at

C.on
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单项选择题
The young man refused ______the old man's advice.
A. to listen
B. to listen to
C. listen to
单项选择题
The ______day of a week is Sunday.
A. first
B. one
C. last
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