题目

若∠1与∠2的关系为内错角，∠1=40°则∠2等于（     ） A．40°          B.140°             C.40°或140°        D.不确定 答案：DThe reason ________ he was late for school was ________ he had been knocked down by a bike. [　　] A．that; whyB．why; that C．why; becauseD．that; because