The murder is terrible.FBI has started to look into.investigate 不是look into
问题描述：
The murder is terrible.FBI has started to look into.
investigate 不是look into
答
look into 后要加宾语，而investigate可以不加，所以答案应是look into
答
look into 要加宾语的，而investigate可以不加宾语，这里是不能换的
答
investigate 是及物和不及物都可以的动词,
而look into属于不及物,所以这里如果用look into的时候后面要加it或the murder.
答
investigate 调查
look into 一半般用在查资料的时候