116. (30709-!-item-!-188;#058&005763)
George Washington Carver 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 the diversification of crops (C) 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 economic strengthening in the South with improving soil and diversifying crops
key C
请问这里的in 和of有什么区别,为啥答案用of不用in呢? |