单项选择题

When he was ______ he had become a professor.

A. in his early thirty
B. in his early thirties
C. in his thirty early
D. in his thirty earlier
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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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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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