Idon'tknowwhatwouldhappenifwewer

发布时间：2020-07-09 19:44:24

I don't know what would happen if we weren't here to keep an eye ________ your younger brother.













A.in












B.at











C.for











D.on

网友回答

D解析keep an eye on sb.密切注视某人。
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