问题描述：
单数句变成复数句
1.He is a doctor.
2.She is a musician.
3.This piano is black.
4.What's your telephone number?
5.The box is big.
6.Where is your computer?
1.He is a doctor.
2.She is a musician.
3.This piano is black.
4.What's your telephone number?
5.The box is big.
6.Where is your computer?
问题解答：
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