They ask the teacher _____ help.A.on B.at CThey ask the teacher _____ help.A.onB.atC.forD.in请问选什么?为什么这么选?

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They ask the teacher _____ help.A.on B.at C
They ask the teacher _____ help.
A.on
B.at
C.for
D.in
请问选什么?为什么这么选?

C
ask sb.for sth.为向某人寻求某物/事

C . ask sb. for sth. 固定用法