As its sales of computer products have surpassed those of measuring instruments, the company has become increasingly willing to compete for the mass market sales they would in the past have conceded to rivals.
(A)they would in the past have conceded to rivals
(B)they would have conceded previously to their rivals
(C)that in the past would have been conceded previously to rivals
(D)it previously would have conceded to rivals in the past
E最‘传统’的表达方式为it would have conceded to rivals in the past，但是这样的结构回有in the past修饰rivals的歧义所以要把in the past置前，所以have为原型没有错，另外that这里省略是可以的，貌似所有从句中只有表语从句中的引导词不能省略（这点我也不是很确定）作者: bobchowz 时间: 2012-4-6 08:08
E选项是虚拟语气，If he had taken my advice,he would not have made such a mistake. 如果他听我的劝告的话，就不会犯这样的错误了。 （事实：没有听我的话）
这句话是定语从句，可是 mass market sales 在定语从句中作为 宾语，故引导词可以省略。
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