A-A+
【C15】A．must have been preventedB．might have be
问题详情
【C15】
A．must have been prevented
B．might have been prevented
C．should have been prevented
D．cattle have been prevented
参考答案
正确答案：B
解析：根据语法填，此处为虚拟语气，might have been prevented表示可能被避免。
考点：
问答库
