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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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
单项选择题
She can't help ______ the house because she's busy making a cake.
A. to clean
B. cleaning
C. cleaned
D. being cleaned
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