Question

(经典回放)He made another wonderful discovery, ________ of great importance to science．

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A．which I think is

B．which I think it is

C．which I think it

D．I think which is

Answer 1

答案：A
提示：

句意为“他又有了一个了不起的发现，我认为这个发现对于科学界来讲是非常重要的”。本句后面部分应为定语从句，I think作插入语，which在从句中作主语，修饰discovery。