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how many ball pens are there in the pencil-box?为什么中间要加are there?

题目详情
how many ball pens are there in the pencil-box?为什么中间要加are there?
▼优质解答
答案和解析
做谓语 + 主语
陈述句是 there are (多少个)bal pens in the pencil-box.
How many(特殊疑问次) +陈述句.
所以how many ball pens are there in the pencil-box?