(2013·东北四市一模)After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent.
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that
B
what
C
when
D
at which
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We still remember the day ______ we spend repairing the old house.
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what
B
on which
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when
D
which
The company has recently taken on fifty new workers some of_______ have just graduated from university.
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A
which
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Jim passed the driving test, __________ surprised everybody in the office.
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A
what
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that
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which
D
it