单项选择题

It is no use ______ what has been done.

A. to regret
B. regretted
C. regretting
D. regret
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单项选择题
Look! The children grew taller ______.
A. year after year
B. again and again
C. step and step
D. year by year
单项选择题
Little Tom was reluctant to tell the schoolmaster ______ he had done the day before.
A. that
B. how
C. where
D. what
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