a 1972 agreement between canada and the united states reduced the amount of phosphates that municiplities had been allowd to dump into the great lake A. reduced the amount of phosphates that municipaliteies had been allowed to dump D.reduced the amount of phosophates that municipalities are allowed to dump
请问为什么不选A？ HAD BEEN ALLOWED这里为什么错呀 我理解是 过去在1972年前一直到1972BEEN ALLOWED的 为什么非要用ARE呢
时态问题。Reduced过去式修饰1972年发生的事儿，amount of phos是正确的。可以排除BCE. 重点在于区别 had been allowed 和 are allowed。 如果要用had been allowed的话，是在说这个条约减少了（在订立之前）的倾倒量。试问过去允许的倾倒量怎么可以在1972年，通过协议的方式减少呢？协议影响的应该只是订立生效之后的倾倒量。 确定了这一点之后，我们可以看到还有两个选择are allowed （说这句话的现在依然生效）和were allowed（说这句话的时候已经失效了）。但是选项中没有这一项选择。
我也选的是a，昨天纠结了半个多小时啊，白花花的时间。。。。。。说说我的理解。 had been allowd to dump 是过去完成时，表示过去某个点开始是不允许的，但是在这个店之前是允许dumping的，但是由于只是reduced,也就是一直在dumping ..OG 的解释An agreement that occurred in 1972 is correctly described with the past tense verb reduced. Since the dumping continued after the date of the agreement, the past perfect verb bad been allowed should instead be the present are allowed (if the agreement remained in effect when the sentence was written) or the past were allowed (if the agreement was no longer in effect when the sentence was written). Since were allowed does not appear in any of the options, we can assume that the correct verb tense is are allowed. 但是对于上面两个部分的解释，我还是很纠结，不理解是什么意思？求指教
had been allowed 表示在agreement 之前就已经不存在了，那已经不存在的倾倒怎么reduce呢？
还有一个逻辑错误是had been allowed 是法规内容，怎么法规内容比订立法规的时间海藻呢？
have been allowed 是同样的意思，即还是法规内容比法规订立时间还早，区别只是持续到现在罢了。
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发表于 2011-4-2 14:15:19
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