问题描述：
The following _____ some other examples.
A.are B.is
I have finished a large part of the book,the rest of which ____ more difficult.
A.is B.are c.was d.were
A.are B.is
I have finished a large part of the book,the rest of which ____ more difficult.
A.is B.are c.was d.were
问题解答：
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