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---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 th

---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

试题