-Alice,why didn't you come yesterday? -I ____ ,but I had an unexpected visitor.

-Alice,why didn't you come yesterday?

-I ____ ,but I had an unexpected visitor.

A had B would C did D was going to

答案D

分析

was going to是be going to do sth.的过去时态，表示过去即将发生的动作。整句的意思就是我准备来的，结果。。。