单项选择题

The scientist has made another wonderful discovery, ______ is of great importance to science.

A. which I think


B. which I think it
C. of which I think


D. I think which
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单项选择题
This article deals with the natural ______ which is most interesting to everyone.
A. phenomenon


B. phenomena
C. phenomenons


D. phenomenas
单项选择题
Language belongs to each one of us, to the flower-seller ______ to the professor.
A. the same as


B. as long as
C. as much as


D. as far as
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