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 it is
B. which I think it is
C. which I think it
D. I think it is
A
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________that he made an obvious mistake,Jeff went on with his speech.
| A.Not realized | B.Not realizing |
| C.Not to realize | D.Not to have realized |