【題目】He made another wonderful discovery, _______ of great importance to physics.

A.which I think it isB.which I think it

C.I think which isD.which I think is

【答案】D

【解析】

句意：他又做了一個了不起的發(fā)現(xiàn)，我認為這對物理學很重要。

考查定語從句。本句是非限制性定語從句，先行詞discovery是物，故用which引導此定語從句，I think是插入語，放在which的后面，故選D。

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