---I called you yesterday evening but there was no answer.　　　　Oh I’m sorry. I di

问题补充：

---I called you yesterday evening, but there was no answer.

----- Oh, I’m sorry. I dinner at a restaurant at that time.

A. have

B. had

C. was having

D. have had

答案：

A. have

B. had

(答案→)C. was having

D. have had

解析：考查时态。句意：昨天晚上我给你打电话，但是没人接。噢，很抱歉，我当时正在饭馆吃饭。根据题中的时间状语at that time 时过去进行时的语法标志之一，所以选C。