改错Although a great number of houses in that area are still(A) in need of repair(B),there have

题目

改错Although a great number of houses in that area are still(A) in need of repair(B),there have
Although a great number of houses in that area are still(A) in need of repair(B),there have been(C)much improvement in their(D) appearance

答案

C 错,把there have been 改成 there has been
there have been后面的名词much improvement明显是不可数名词,根据就近原则,要把助动词have变成单数形式has.