—Mike why didn’t you come yesterday? —I but I had an unexpected visitor.A. hadB. wouldC

问题补充：

—Mike, 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：

A. had

B. would

C. did

(答案→)D. was going to

解析：考查时态。句意：麦克，昨天你为什么没有来？我打算来着，但是我有一个意料外的访客。Be going to表示计划打算做的动作，结合语境可知选D。