He put forward a theory,（）of great importance to the progress of science of technology<br>A:I think which is <br>B:which I think is <br>C:which is I think <br>D:I think it is

He put forward a theory,（）of great importance to the progress of science of technology
A:I think which is
B:which I think is
C:which is I think
D:I think it is

出自：专升本

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