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 it is
A
I think 是插入語(yǔ),  which 引導(dǎo)一個(gè)非限制性定語(yǔ)從句, 在從句中作主語(yǔ).
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