单项选择题

He has made another discovery, () of great importance to science.

A. which I think it is
B. of which I think it is
C. which I think is
D. I think which is

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After paying 1 O00 dollars () , you'll all become full members of our club.

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B. all
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() travel round the world alone shows that he is full of courage.

A. His deciding of
B. He decides
C. His decide
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