观察下列数的特点：1，2，2，3，3，3，4，4，4，4，… 中,第100项是 A

观察下列数的特点：1，2，2，3，3，3，4，4，4，4，… 中,第100项是

A．10 B. 13 C. 14 D.100

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观察下列数的特点：1，2，2，3，3，3，4，4，4，4，… 中,第100项是 A

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