(单选题)

As Malcolm S. Forbes puts in, the first step toward success is taken ______ you refuse to be a prisoner of the environment in which you first find yourself.

A.when

B.how

C.what

D.where

参考答案：A

参考解析：

考查when引导的时间状语从句。句意：正如马尔科姆·S·福布斯所说，当你拒绝成为你最初所处环境的囚徒时，你就迈出了通往成功的第一步。分析句子成分可知，主句结构为the first step toward success is taken，意为“你就迈出了通往成功的第一步”，______ you refuse to be a prisoner of the environment in which you first find yourself充当时间状语从句，在从句中又嵌套一个定语从句，即in which you first find yourself。根据句意可知when符合题意。故选A。

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