John's success has nothing to do with good luck. It is years of hard work has made him what he is today.
A. why
B. when
C. which
D. that
网友回答
A. why
B. when
C. which
(答案→)D. that
解析：句意：他的成功与运气没有关系，是多年的努力造就了他的今天。强调句型的基本结构为：It is+被强调部分+that+其余部分。判断是否为强调句型的方法为：去掉Iｔ ｉｓ 和ｔｈａｔ之后剩余部分正好构成完整的句子即为强调句型。