Those boys many times not to go on line, but it doesn’t make any difference.
A. have told
B. told
C. have been told
D. were being told
网友回答
A. have told
B. told
(答案→)C. have been told
D. were being told
解析：考查时态语态：those boys和tell是被动关系，排除AB，根据第二句话，可知用现在完成时的被动，句意：这些男孩被告知很多次不要上网，但没有差别。选C。