我会选出正确答案补全句子。
1．
A：What's this?
B：It's ___________ (a pen／two pens).
2．
A：How many pencils do you have?
B．I have ________________ (a pencil／four pencils).
3．
A：How many rulers do you have?
B．I have _____________________ (a ruler／five rulers).
4．
A：How many crayons do you have?
B．I have _________________________ (three crayons／four crayons).
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