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

—Oh, I'm sorry. I _______ dinner at my friend's home. [ ]

A. had

B. was having

C. have had

从“一五”计划到“十一五”规划，中国的富民强国梦想正一步步变成现实。其中“八五”计划（1991—1995）为中国现代化作出的最大贡献是

A．奠定了社会主义工业化的基础

B．开放沿海十四个港口城市

C．打破人民公社的平均主义体制

D．确立社会主义市场经济体制改革目标