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John’s success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.
A.thatB.whenC.whichD.why
A

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。
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