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It was many years ____ she made a fortune and established an

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It was many years ____ she made a fortune and established an insurance company.
A.since B.when C.that D.before
Which one?why?
D
before是在...时间之前,奋斗了许多年了;而since是自从...到现在,但made这个时态与现在无关,故错误;that的话就只能理解为强调句了,但是去掉It was.that后,句子是不成立的,故错误;when是“当...的时候”,词义错误,它无法表明was这个状态的时间.
若强调句的话应该说:It was for many years that she made.