He made another wonderful discovery, _______ of great importance to science.
A．which I think isB．which I think it
C．which I think it isD．I think which is
A

試題分析:考查定語(yǔ)從句。根據(jù)結(jié)構(gòu)可知逗號(hào)后面是定語(yǔ)從句，從句中I think是插入語(yǔ)，which是關(guān)系代詞做主語(yǔ)，由此可知A選項(xiàng)正確。 句意：他又有了一個(gè)奇妙的發(fā)現(xiàn)，我認(rèn)為這對(duì)科學(xué)界很重要。
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