题目

My brother always goes to the library ______ Saturday morning. A. on B. in C. at D. to 答案：【答案】A【解析】试题分析：句意：我的弟弟在周六早上总是去图书馆。A. On加具体的上，下午；B. In加年，月，季节；C. At加具体的时间点；D. To到……；结合语境，故选A。He has not ____ his mistake.A.thoughtB.toldC.realizedD.looked