He made another wonderful discovery, _______________ of great importance to science.
A．which I think isB．which I think it isC．which I think itD．I think which is
A
考察定語(yǔ)從句和插入語(yǔ)。I think在句中作插入語(yǔ)，可以省略。Which指代先行詞another wonderful discovery在句中作主語(yǔ)。故A正確。
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