第一题.你少打了个t吧.
1.All of the plants now raised on farms have been developed from plans（应该是plants吧）_______wild
那就是一个定语从句了,只能选a啊
第二题是虚拟语气,因为后面出现了was,所以前面虚拟要用过去完成时
第三题.考的是there be的句型,there be的句型,虽然后面的是主语,但形式上的主语应该是there
因为有expect sb/sth to do 的句型所以用to be
1.All of the plants now raised on farms have been developed
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