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
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Stephen Hawking believes that the earth is unlikely to be the only planet _______ life has developed gradually.
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that
B
where
C
which
D
whose
Spring Festival is the most important festival in China and an occasion ____ all family members get together, just like Christmas in the West.
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where
B
when
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that
D
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I will always remember the days_____ I spent with you in that village.
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A
on that
B
in which
C
when
D
that