2. 外语
  3. As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as m

As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as m

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问题 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.
选项 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 then
E、yet are slipping since then,because many companies were unable to pass on higher costs
答案A
解析 由句意知slip和be able to这两个动作都是同时发生在过去并且持续到现在的动作，因而两个动作都应该用现在完成时，C、D、E不仅时态不对，结构还混乱。B中的the reasonbeing是多余的，在这里值得一提的是，本句未划线的句首用了as measured by the CommerceDepartment这样一个短语，as就是指代之后的整个主句内容。后一个as从句是表原因的。
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