-Whendidtheaccidenthappen?       -Ithappened         9:...

问题详情：

-When did the accident happen?

        -It happened          9:15           the morning of April  lst, 2015.

         A. on; in          B. at; in        C. at; on        D. on; on

【回答】

C

知识点：介词和介词短语

题型：选择题