OG(11th)--SC 第5题

5.        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)      it would in the past have conceded to rivals

第5题中划线部分they would in the past have conceded to rivals在句中是作什么成分,整个主句的语法结构我就不是很清楚