题目内容
3．We sent Tiangong-1into the space ______ September 29th．（ ）| A． | by | B． | on | C． | at | D． | in |
分析 我们在9月29日把天宫1号发射到了太空．
解答 答案：B 根据时间September 29th可知这是具体到了某一天，前面应用on．by+时间点；on+具体到某一天；at+时间点；in+年、月、季节等．故选B．
点评 本题考查时间介词的辨析．熟记时间介词的用法是做题的关键．
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