题目内容
14．---What time did you return from Beijing？---______the morning of April 1st．（ ）| A． | At | B． | On | C． | In | D． | By |
分析 --你什么时候从北京回来的？
--4月1日上午．
解答 答案：B．考查介词．句意"--你什么时候从北京回来的？--4月1日上午．"．at在具体的几点．on表示在具体某一天．in表示在一个具体范围．by通过、由．结合语境"4月1日上午"可知，具体某一天用介词on．答案是B．
点评 考查介词用法，这个知识点很广泛，有一些固定用法，需要日常积累，结合语境选择正确介词完成习题．
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