Speciation, ______, results when an animal population becomes isolated by some f

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问题 Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.

选项 A、form biological species
B、biological species are formed
C、which forming biological species
D、the formation of biological species

答案 D

解析考查同位语成分。空格位于两个逗句之间，是对主语的补充说明，可以是主语的同位语、状语或者是定语从句。选项D是名词短语作同位语，符合题意，为正确答案。选项A是动宾结构，不能修饰前面的主语；选项B为完整的句子，也不能修饰前面的主语；选项C不是定语从句，且逻辑不通。

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