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When was it______ he found ______ he thought was the correct

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When was it______ he found ______ he thought was the correct way to solve the proble
When was it______ he found ______ he thought was the correct way to solve the problem?
A.that; what
B.that; that
C.when; what
D.when; that
选A,第一空为定语从句,代后面这句话(可省略)第二空为宾语从句,做found的宾语,应为what