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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.of, to meanD.in, meaning
B
固定词组。For free免费;be meant to do sth 想要做某事;句意:PAS构成是免费的。想要教育人们关于健康,安全,或者其它一些影响公共福利的问题。
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