In 2009 many countries are going through financial crisis，________has a great effect on many walks of life.
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A
it
B
which
C
that
D
what
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I am very grateful to my high school teachers, without _____help I wouldn’t be so excellent.
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A
whom
B
their
C
which
D
whose
The volunteers will visit the primary school next Monday ,_______all the students are children of migrant workers,
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A
which
B
who
C
when
D
where
International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.
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A
which
B
what
C
where
D
that
Helen was much kinder to her youngest son than to the others, ______, of course, made the others envy him.
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A
who
B
which
C
what
D
that