The police will have investigated that murder case for a month by the time their helpers come to help.
The police will have investigated that murder case for a month by the time their helpers come to help.
到他们的夥伴来帮助时，警察将已调查那宗谋杀案一个月了。.
The police will have investigated that murder case for a month by the time their helpers come to help.
到他们的夥伴来帮助时，警察将已调查那宗谋杀案一个月了。.