---Three people got killed by two explosions.---When was __________?---________

题干

---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

上一题下一题 0.85难度单项选择更新时间:2013-06-28 09:50:34

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