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
D. I think which 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
D. I think which is
答案：A