George Washionton dedicated his life to the economic strengthening of the south with improvement of soil and diversification of crops.
A. the economic strengthening of the south with improvement of soil and diversification of crops.
B. strengthening the economy in the south with soil improvement and diversification of crops.
C. the strengthening the economy of the south through soil improvement and crop diversification.
D. the strengthening of the economy of the south through improving soil and crop diversifying.
E. the wconomic strengthening in the south with improving soil and diversify crop.
答案C
想請答案C中crop 不需要修正為crops嗎
而各選項中的介係詞不同 有with, through會產生差異嗎