刚刚开始准备,问个傻问题.

 An array of tax incentives has led to a boom in the construction of new office buildings; so abundant has capital been for commercial real estate that investors regularly scour the country for areas in which to build.

(A)                  so abundant has capital been for commercial real estate that

(B)                  capital has been so abundant for commercial real estate, so that

(C)                  the abundance of capital for commercial real estate has been such,

(D)                  such has the abundance of capital been for
                commercial real estate that

(E)                  such has been an abundance of capital for
                commercial real estate

The answer is A. I understand so.. that structure. .. but still confusing. pls help. thanks