The two brothers often argue ________ which football team is the best and they never ________ an agreement．A.for; arrive atB.about; get toC.over; reachD.against; reach out
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C解析argue for/against sth．意为“赞成/反对”，argue over/about sth．意为“(就)产生争议”。根据句意应排除A、D两项；“达成协议”为e to/reach/arrive at an agreement，故选C项。