after before的问题

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after before的问题
Three years had passed _______ the vegetable hero came to life with the intensive care and loving call of his wife.
A) after
B) before
我选了A
请大人分析

前半句的时态是过去完成时态,后半句是过去时态.所以暗示了前半句的事情发生在先.所以用before

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