---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 |
---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 |