He got himself into a difficult situation he must make a final decision all by himself.A.

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A. which
B. what
C. when
(答案→)D. where
解析：
试题分析:考查定语从句。从结构可知situation后是定语从句，从句句意完整，应该用关系副词引导从句，而situation是抽象名词，所以用where引导。正确答案为D。句意：他让自己陷入了一个很难的处境，在这种情形下他必须完全靠自己做出最终决定。