单项选择题

— Help yourself to some more food. — ______ , I am already full.

A． OK
B． Thank you
C． No
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单项选择题
Forty miles ______ distance(距离) for me to walk in one day.
A． is quite a long
B． are quite long
C． are quite a long
单项选择题
He ______ here for five minutes before I arrived.
A． has come
B． had arrived
C． had been
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