Question

There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.

A．to which

B．in which

C．for which

D．on which

Answer 1

A 

解析试题分析：考查定语从句：先行词是an environment，定语从句中adapt后面缺少介词to，用to which引导定语从句。句意：地球上很难有一种环境，一些动物和其他的物种不能成功的适应的。选A。
考点：关系代词在句中作主语，宾语，表语或者定语；关系副词在句中做状语。所以要分析句子中缺什么成分来确定使用何种关系词。如果缺少介词，需要选用适当的介词，介词+which/whom可以引导定语从句。