单项选择题

My grandpa is very old and wears ______ false teeth.

A．a set of
B．a piece of
C．a sheet of
D．a pair of
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单项选择题
His father went to Shanghai and ______ last month.
A．wrote him a letter
B．wrote a letter to him
C．wrote to him
D．A, B and C
单项选择题
He wrote ______ composition to praise his teachers.
A．a two-hundred--words
B．a-two--hundred- word
C．a two--hundred--word
D．a two--hundreds--words
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