Do you know Nelson Mandela, _______ was the first black president of South Africa.
#42727
A
which
B
that
C
who
D
whose
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May the fourth is the day __________ we Chinese people will never forget.
#42994
A
which
B
when
C
on which
D
why
The book _______ my husband bought in Shenzhen yesterday was very interesting.
#42668
A
who
B
where
C
when
D
which