He came to a point ______ there was no more road to follow, and before him he could see nothing but a thick forest.
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A
that
B
what
C
which
D
where
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The river, ____ are covered with trees, is very long.
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A
which banks
B
of which banks
C
whose the banks
D
the banks of which
It was said            was how the Chinese first raised silk worms.
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A
that what
B
that which
C
that who
D
that that