题目内容

He made another wonderful discovery, ________ of great importance to science.

[  ]
A.

which I think is

B.

which I think it is

C.

which I think it

D.

I think which is

答案:A
解析:

本题考查非限制性定语从句。题意是“他又有了重大的发现,我认为这次发现对科学很重要。”很明显discovery后是一个非限制性定语从句,且先行词discovery在从句中充当主语,故用which引导。此题的难点在于定语从句中加入了一插入语I think,去掉I think后就可看出不能使用it或it is。故答案为A。定语从句中常加入I think, I guess, I believe, I am afraid, I'm sure等插入语,使得句子变得较为复杂,如:I suggest you choose someone who you think is kind and friendly./Last night I came across the man who you think is pleasant to work with.又如本单元课文中的一句话:Some ancient Chinese alchemists were mixing some ingredients together to form something that they thought would make them live forever.


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