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---Do you know about a very popular toy--- the yo-yo(悠悠球)? ---Yes. Filipinos(菲律宾人) invented it _____...
题目内容：
---Do you know about a very popular toy--- the yo-yo(悠悠球)?
---Yes. Filipinos(菲律宾人) invented it ________ accident. And it ________ helping kill animals.
A. at; used to B. on; was used to
C. by; used for D. by; was used for
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