题目内容
6．Michael left America _________ a warm spring morning．（ ）| A． | in | B． | on | C． | at |
分析 迈克尔在一个温暖的春天的上午离开了美国．
解答 答案：B 有定语修饰的morning，afternoon等 前都用on，没有定语就直接用in the morning/afternoon，本题在一个温暖的春天的上午．morning 前面有修饰词，应该用on，故选B，
点评 本题考查介词的辨析，介词的用法一般都是固定的．熟记介词的用法及结合语境是解答本题的关键．
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