题目内容


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
考查定语从句。句中I think为插入语，先行词为discovery，在定语从句中作主语，故选A。句意：他又有一个杰出的发现，对科学有很大的作用。
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