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PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other p...
题目内容：
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 |
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