问题
选择题
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 it is
答案
答案：A
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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 it is
答案：A