单项选择题

Excuse me. May I have a piece of __________, please

A. water
B. knife
C. paper
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单项选择题
I ______ go there this morning, so I stayed home.
A. didn' t need to
B. didn' t need
C. needn' t to
单项选择题
The meaning of music will become clearer to you ______ you listen to it a second time.
A. when
B. though
C. but
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