my sister three times today but her line was always busy.
A. I’d phoned
B. I’ve been phoning
C. I’ve phoned
D. I was phoning
网友回答
A. I’d phoned
B. I’ve been phoning
(答案→)C. I’ve phoned
D. I was phoning
解析：全句意思为“今天我给姐姐打了三次电话，但是她的电话总是占线”。首先依据时间状语today，排除A、D两项；现在完成进行时多表示持续不断的动作，用在此处不妥。故选C项。