—Alice why didn’t you come yesterday?—I but I had unexpected visitor.A. hadB. wouldC. w

问题补充：

—Alice,why didn’t you come yesterday?

—I ,but I had unexpected visitor.

A. had

B. would

C. was going to

D. did 

答案：

A. had

B. would

(答案→)C. was going to

D. did 

解析：从对话but后面分句的含义为“但我却有一位不速之客须接待”。由此可推知其前分句表述的意思应为“我正打算要来（我本打算要来）”。故惟有C项可表达此意，若B项改为would have亦正确。