---Three people got killed by two explosions.---When was ?--- was on April 15 th
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---Three people got killed by two explosions.
---When was __________?
---________ was on April 15 __________ the 2013 Boston Marathon was being held.
A.that; It; when
B.this; This; that
C.this; It; when
D.that; It; that
试题答案
A
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