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 Occasions are quite rare ____I have the time to spend a day with my kids.
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who
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which
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why
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when
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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
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How I wish we studied ________there are fewer exams .
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单项选择（每题1分）_____ seems to be a possibility that we shall be able to afford the car we need.
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Over a hundred children ______ parents were killed in the Wenchuan earthquake have been adopted and taken good care of by kind­hearted couples.
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who
B
that
C
whose
D
which
He is a foreigner, ___ I knew from his accent.
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A
which
B
as
C
that
D
A and B