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I meant _________ you, but I was so busy.
A、to call on
B、calling on
C、to call at
D、calling at
【正确答案】：A
【题目解析】：call on 拜访（人）； call at 访问（地点）；因此CD排除，mean to do 打算做……；mean doing 意味着……；因此选A