问题
选择题
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
答案：C
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。