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主题：
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ago/before的区别 |
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内容：
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Mr Smith expained that Tom had told him about his past ____.
A.three weeks ago B.before three weeks
C.since three weeks D.three weeks before
选D，怎么选啊？ |
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提交人：
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piaozy
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时间：
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5/27/2002 14:11:8
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主题：
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ago/before的区别 |
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内容：
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Mr Smith expained that Tom had told him about his past ____.
A.three weeks ago B.before three weeks
C.since three weeks D.three weeks before
选D，怎么选啊？
解答：我想你肯定是在选项A、D直接有疑问。
three weeks ago表示从现在算起的“...以前”，用ago的时间参考点是现在，谓语动词用一般过去时。如：
John left a few minutes ago.
three weeks before则是从某一个过去时间点算起的“...前”。在使用before的前提时必须有一个表示过去时间点作为参考，谓语动词常用过去完成时态。如：
He said that he had seen her two days before (时间参考点He said)
本题既有过去的时间参考点，又时过去完成时，所以应该选择D。 |
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提交人：
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tchzhangxj
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时间：
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5/27/2002 14:11:13
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