题目内容

He has been running______.
A．since two hoursB．for two o’clock
C．two hours agoD．for two hours
D

试题分析：在表示时间时，since后接时间点，表示自从……以来；for后面接一段时间，用于完成时态；ago用在一段时间之后，表示过去某个时间。句意：他已经跑了两个小时。结合语境可知选Ｄ。
点评：该题型是属于英语考试的基础题型，是必考内容。英语单词同汉语一样具有一词多义，一词多性的特点。解答此类问题首先要理解每个选项的基本含义，并注意交叉含义间的区别，了解其特殊用法，然后结合语境选择正确答案。
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