PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare.A．for, meanB．for, meantC．-高中英语-n多题

◎ 题干

PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare.

A．for, mean

B．for, meant

C．of, to mean

D．in, meaning

◎ 答案

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◎ 解析

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◎ 知识点

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