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As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as many companies have been unable to pass on higher costs.

正确答案: A

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问道很简单的题,因为以前没人问过。。。

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楼主
发表于 2011-3-22 15:23:44 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
1.As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as many companies have been unable to pass on higher costs.
(A) and have slipped since then, as many companies have been unable to pass on higher costs
(B) and have slipped since then, the reason being because many companies have been unable to pass on higher costs
(C) and slipped since then, many companies being unable to pass on higher costs
(D) but, many companies unable to pass on higher costs, they have slipped since thenA
(E) yet are slipping since then, because many companies were unable to pass on higher costs

and 前后时态用法搞不清,可以前面过去式,后面现在完成时的么?
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沙发
发表于 2011-3-22 15:46:18 | 只看该作者
我觉得可以的呀~
因为and后面有个since then,是完成时的标志,所以用完成时

不知道是不是这样?
板凳
发表于 2011-3-22 20:14:29 | 只看该作者
and 应该可以连接时态不同的。前后都是动词+时间 平行。
地板
发表于 2012-2-15 22:26:54 | 只看该作者
这里as是表示原因吗?
那为什么不在句首呢
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