单项选择题

______ from heart trouble for many years, Professor Brown has to take some medicine with him wherever he goes.

A. Suffered
B. Suffering
C. Having suffered
D. Being suffered
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单项选择题
It is no use ______ what has been done.
A. to regret
B. regretted
C. regretting
D. regret
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
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