—The earthquake in Yaan took place two past eight the morning of April 20th.—Yes some pe

问题补充：

—The earthquake in Yaan took place two past eight the morning of April 20th.

—Yes, some people were still sleeping for it was weekend.

A. in ; on

B. on ; in

C. at ; in

D. at ;on

答案：

A. in ; on

B. on ; in

C. at ; in

(答案→)D. at ;on

解析：

试题分析：在表示时间时,in表示在一个时间范围;at表示在具体时刻;on表示在具体某一天. two past eight是具体几点钟，故前面用介词at。the morning of April 20th.是具体的某一天，故用介词on。选D。

考点：介词辨析

点评：英语介词的一个特点是一词多义，并且介词间语义交叉现象很多，习惯用法也很多，有时很难从词义上区分开来。故学习中要注意不断总结，熟记一些介词和动词的固定搭配用法及习惯用法，是完成此类问题的捷径。