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问题

Only recently______to realize the dangers caffeine(咖啡因)might bring to our health.A.that


Only recently______to realize the dangers caffeine(咖啡因)might bring to our health.

A.that scientists began

B.have scientists begun

C.scientists have begun

D.that did scientists begin

请帮忙给出正确答案和分析,谢谢!

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