题目内容
10．The soldiers went to help people in Guizhou __________ Sunday morning．（ ）| A． | in | B． | on | C． | at | D． | of |
分析 在星期天的早上，士兵们去帮助在贵州的人们．
解答 答案：B．根据时间状语Sunday morning，可知句子中的时间状语是"星期天的早晨/上午"，具体到了某一天的早晨/上午，要用on．in+年、月、季节等；on+具体的某一天或某一天的上午/下午/晚上；at+具体时间点． 故选B．
点评 本题考查时间介词和固定短语的用法．熟记时间介词的用法，掌握每一个时间介词后跟的时间类型，是做题的关键．
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