问题
选择题
— When did the terrible earthquake in YaNan happen? —It happened ________ the morning of April 20, 2013. [ ]
A. on
B. at
C. in
D. /
答案
答案：A
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— When did the terrible earthquake in YaNan happen? —It happened ________ the morning of April 20, 2013. [ ]
A. on
B. at
C. in
D. /
答案：A