(With more than) half the world's( annual yield) of 50 million tons of soy beans ,an( important)( source )of protein ,is( grown in)the United States
答案是a 可是我觉得应是d 啊 改为growing作者: apply1 时间: 2005-5-14 07:55
D是被种植的意思啊,没错的
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