A. In
B. On
C. At
解析:根据_______the morning of March the 14th, 2018,可知这里指的是在具体的某一天的早上,用介词on。故选B。
答案:B
《__________ the morning of March the 14th, 2018, Stephen William Hawking(霍金), a》出自:百味书屋
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A. In
B. On
C. At