It was the training ______ he had as a young man ______ made him so excellent.
A.what; that
B.that; which
C.that; what
D.which; that
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D解析试题分析：考查定语从句和强调句：句意：就是他年轻的时候接受的训练使他这么优秀。第一个定语从句，先行词the training ,关系代词在从句中充当had的宾语。用that/which引导定语从句，第二个是强调句型：It was ... that...，强调的是主语the training。填that，选D。
考点：考查定语从句和强调句