i wondered what out monitor meant __ saying thata、a、on b、for c、by_英语解答

i wondered what out monitor meant __ saying that
a、
a、on b、for c、by d、with
请说明选择理由

人气：375 ℃　时间：2020-04-02 21:47:54

解答

选C by saying that好像是一种习惯用法.