Crops such as peas or soybeans put important minerals back into the soil, it ready for crops that need fertile soil.
A. makes
B. to make
C. made
D. making
网友回答
A. makes
B. to make
C. made
(答案→)D. making
解析：本题考查非谓语动词。题中making it ready for crops that need fertile soil在句中作结果状语，选D。