问题
选择题
________ Sunday morning, he cleaned his room. _______ the afternoon, he did his homework. __________ night, he watched Olympic Games.
A．On; On; On
B．On; In; At
C．On; In; In
D．In; In; At
答案
B
题目分析：考查介词。句意：在周日早上，他打扫房间，下午，做作业，晚上看奥运会比赛。第一个空特指早上用on，而第二个空考查in the afternoon,在下午，at night在夜晚，固定短语，所以选B项。