单选题If the students who 

问题补充：

单选题Ifthestudentswhokilledthemselveshadonlybeenmoreconfident,theirdeaths________.A.need have been avoidedB.must have been avoidedC.might have been avoidedD.will have been avoided

答案：

C解析might have done，对过去的虚拟。“他们的死可能会被避免”，their deaths与avoid之间为动宾关系，因此选C。