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    【题目】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：他又做了一个了不起的发现，我认为这对物理学很重要。

    考查定语从句。本句是非限制性定语从句，先行词discovery是物，故用which引导此定语从句，I think是插入语，放在which的后面，故选D。

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