John’s success has nothing to do with good luck. It is years of hard work has made him a great scientist today.
A. that
B. when
C. which
D. why
网友回答
(答案→)A. that
B. when
C. which
D. why
解析：
这题考查强调句的用法：It’s+强调部分+that…,这句话强调的是主语，years of hard work，句意是：约翰的成功和幸运无关，是多年的努力使他成为伟大的科学家。选A。