Animals can live only on______plants have already turned from inorganic to veget

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问题 Animals can live only on______plants have already turned from inorganic to vegetable matter.

选项 A、that
B、which
C、what
D、how

答案 C

解析该句大意是“动物生存所依赖的物质是植物把无机物变成有机物时产生的。”What引出宾语从句，同时该词在从句中作宾语。

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