He made another wonderful discovery, ____ of great importance to science.
A．which I think isB．which I think it is C．which I think itD．I think which is
A
考查定語從句。句中I think為插入語，先行詞為discovery，在定語從句中作主語，故選A。句意：他又有一個杰出的發(fā)現(xiàn)，對科學有很大的作用。
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