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题文

---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
科目 英语   题型 单选题   难度 容易
知识点: 介词短语 语态的辨析
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