---Three people got killed by two explosions.---When was __________?---________ was on April 15 __________ the 2013 Boston Marathon was being held．
#76612
A
that; It; when
B
this; This; that
C
this; It; when
D
that; It; that
推荐题目
The engineer __________ my father works is about 60 years old.
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A
to whom
B
on whom
C
with whom
D
with which
He constantly gets into awkward and absurd situations, ____ audience can be greatly amused.
#77180
A
which
B
where
C
that
D
what
International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.
#75126
A
which
B
what
C
where
D
that
The school has developed an online system________ students can choose their own teachers.
#76357
A
which
B
when
C
that
D
where
These old pictures bring to their mind the college days ________ they spent together, ________ life was hard but happy.
#76359
A
when; whose
B
which; whose
C
which; when
D
when; which