Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _____ int

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Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _____ introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks.

A：them; whe

B：which; that

C：what; that

D：which; whe

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B

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