John's success has nothing to do with good luck. It is years of hard work has made him wha

问题补充：

Johns 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

答案：

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。