【题目】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.that
C.when
D.which

【答案】B
【解析】考查强调句型。句意：约翰的成功与好运气没有任何关系，是几年的辛苦工作使得他成为今天的样子。因为这是一个强调句，强调句的固定句型是It is ...+that从句，要判断一个句子是强调句，只要看它去掉了It is和that后句子能否仍然成立。若成立，则是强调句。故选B。