If the students who killed themselves had only been more confident their deaths .A. need

问题补充：

If the students who killed themselves had only been more confident, their deaths .

A. need have been avoided

B. must have been avoided

C. might have been avoided

D. will have been avoided

答案：

A. need have been avoided

B. must have been avoided

(答案→)C. might have been avoided

D. will have been avoided

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。