I'm going to call at___________ this evening.

问题描述:

I'm going to call at___________ this evening.
A. Mr Black B. the Blacks  C. Mr Black's D. Blacks'
为什么call at sb后面要带个's

call at place可以理解为I'm going to call at Mr Black's house this evening.那为什么不直接选a呢?a也是正确的呀!用call on sb 表示拜访某人。