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
B
考查定語從句：先行詞是discovery，定語從句中I think是插入語，定語從句中which做主語，it是多余的，句意：海外的中國科學(xué)家做出另一項(xiàng)重大發(fā)現(xiàn)，我認(rèn)為這對(duì)研究艾滋病很有價(jià)值。選B。
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