Question

【题目】—When was China’s first cargo spacecraft, Tianzhou 1 sent into space successfully?

— April 20.

A. In B. On C. At D. Since

Answer 1

【答案】B

【解析】本题考查介词用法。句意“-中国第一艘货运飞船天舟一号什么时候成功发射的？-4月日”。表示具体某一天的时间用on。故选B。