I can think of many cases ______ students can’t write a good article though having a large vocabulary.
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A
where
B
which
C
that
D
to which
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Great changes ______in our city. It is no longer ____ it used to be ten years ago. 
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A
took place, how
B
have taken place ,what
C
are taken place, which
D
take place ,when
—What time will Mr. Brown be back to China? —Sorry. I don’t know______.
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A
when did he go abroad
B
why he is going abroad
C
how soon will he be back
D
how long he will stay abroad