Is this factory ____ we visited last week?
A. where
B. that
C. which
D. the one
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she will never forget the day ____ she spend in Beijing.
A. when
B. what
C. which
D. why
This is the school _____ my father worked 20 years ago.
A. that
B. when
C. which
D. where
This is the very factory ____ we visited last year.
A. that
B. which
C. what
D. the one
The text is one of the most interesting stories _____ learnt in the past three days.
A. that have
B. that have been
C. which has
D. which has been
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