David is such a good boy        all the teachers like.
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A
that
B
who
C
as
D
whom
推荐题目
Is this the factory ___ you visited last year?
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A
the one
B
where
C
that
D
which
They have no idea at all ____________.
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A
where he has gone
B
where did he go
C
which place he has gone
D
where he has gone
As long as the laws of nature ______, there will be tornadoes.
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A
exist
B
are existing
C
will exist
D
existed