---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 |
推荐试卷
---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 |
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