问题描述：
这句话为什么选what?
Animals can live only on _____ plants have already turned from inorganic to vegetable matter.
A.that B.which C.what D.how
这句话答案选C,为什么用what?
定语从句里面不是只能用which和that吗?
Animals can live only on _____ plants have already turned from inorganic to vegetable matter.
A.that B.which C.what D.how
这句话答案选C,为什么用what?
定语从句里面不是只能用which和that吗?
问题解答：
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