题目

He said he would write to us but we_____ from him so far. A. haven’t heard         B. hadn’t heard C. didn’t hear           D. wouldn’t hear   答案：A根据时间状语so far可知应选现在完成时。如图，△ABC中，∠A=60°，∠B=50°，点D在BC的延长线上，则∠ACD=（    ）度。