—When did the great earthquake in Wenchuan happen ?
—It happened 14:28 the afternoon of May 12, 2008.
A. on, in
B. at, on
C. at, in
D. on, on
网友回答
A. on, in
(答案→)B. at, on
C. at, in
D. on, on
解析：考查介词。在具体的 时刻用介词at;具体到某一天的下午使用介词on。泛指在某个上午，下午或者晚上使用介词In.故B正确。