I‘m sorry I don't know,but you can ask them ____ help.A onB for C with

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I‘m sorry I don't know,but you can ask them ____ help.A onB for C with
I‘m sorry I don't know,but you can ask them ____ help.
A on
B for
C with

I‘m sorry I don't know,but you can ask them ____ help.A onB for C with
I'm sorry I don't know,but you can ask them for help.
根据ask sb.for help.向某人请求帮助

I‘m sorry I don't know, but you can ask them for help.

ask sb.for help.向某人请求帮助.

ask sb.for help 向某人请求帮助.

b for