问题描述：
1、Is this factory （ ）you visited the other day?A、the one B、that
2、The professor has written another book,（ ）of great importantce to computer science.
A、which I think it is B、which i think is
2、The professor has written another book,（ ）of great importantce to computer science.
A、which I think it is B、which i think is
问题解答：
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