一到英语语法题The possibility of a murder ____ , the police have se

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/03 12:13:29

一到英语语法题
The possibility of a murder ____ , the police have set about looking for the clues to her suicide.
A.to be excluded B.to exclude C.having excluded D.having been excluded
为何选D 不选C?
为什麽要加ing?这是非谓语吗?那主语又是谁?

首先,一个句子里,如果不使用连词的话,只能存在一个谓语,（当然啦,使用连词的话可能同时有好几个谓语,例如I look and sing and run.）.根据题干已有信息可以判断,整个句子的动词是“have set”,主语是“the police”,“about”为介词（介词后的动词须为ing形式）,“looking for the clues to her suicide”为补语.
根据这个句子意思可以判断,这应该是一个条件状语从句.而前面条件从句部分的主语是possibility,什么样的possibility呢?是“谋杀”的可能性,“可能性”是“被”包括或者“不被”包括的,应该用被动,需体现出来,所以如果“The possibility of a murder”不是从句而是单个句子的话,应该直接表现为have been excluded.但因为它属于这个条件状语从句的从句结构部分,在主句已经存在一个谓语的情况下,句子里不可能再存在另外一个谓语,所以从句中的谓语要非谓语化,所以将have变成having,been仍需保留以继续表达“可能性”是“不被包括”的被动含义.

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