Alice why didnt you come yesterday? --I but I had an unexpected visitor.A. hadB. wo

问题补充：

--Alice, why didn you come yesterday?

--I , but I had an unexpected visitor.

A. had

B. would

C. was going to

D. did

答案：

A. had

B. would

C. was going to

D. did

解析：当不定式在某些结构后作复合谓语时，不定式符号 to后的内容可以省略。常见的结构有：be able to，be going to，have to，ought to，used to等。