题目内容
3．---Could you tell us how long______ asleep？---For about two hours．（ ）
| A． | has he fallen | B． | he has fallen | C． | has he been | D． | he has been |
分析 --你能告诉我们他已经睡了多长时间了吗？
--大约两小时．
解答 答案：D．how long引导的宾语从句，后加陈述句语序，结合句意可知动作发生在过去，持续了一段时间，故用现在完成时have/has+过去分词，主语he，故has，fall asllep是短暂性动词，不能与一段时间连用，故换成be asleep，故选择D．
点评 现在完成时有两种用法1．过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作．2．表示过去发生的、持续到现在的动作或状态．
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