He made another wonderful discovery, ______ of great importance to science.
A．which I think isB．which I think it is
C．which I thinkD．I think which is
A
考查定語從句。句中I think為插入語，which指代先行詞discovery，在從句中作主語。句意：他又有一個(gè)極好地發(fā)現(xiàn)，對(duì)科學(xué)有重要的作用。
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