The overseas Chinese scientist made another wonderful discovery, ______ of great value to study AIDS.A.which I think it isB.which I think isC.I think it isD.I think is
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B解析考查定语从句：先行词是discovery，定语从句中I think是插入语，定语从句中which做主语，it是多余的，句意：海外的中国科学家做出另一项重大发现，我认为这对研究艾滋病很有价值。选B。