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

試題分析：在表示時間時，since后接時間點，表示自從……以來；for后面接一段時間，用于完成時態(tài)；ago用在一段時間之后，表示過去某個時間。句意：他已經跑了兩個小時。結合語境可知選Ｄ。
點評：該題型是屬于英語考試的基礎題型，是必考內容。英語單詞同漢語一樣具有一詞多義，一詞多性的特點。解答此類問題首先要理解每個選項的基本含義，并注意交叉含義間的區(qū)別，了解其特殊用法，然后結合語境選擇正確答案。
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