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
B
固定詞組。For free免費(fèi)；be meant to do sth 想要做某事；句意：PAS構(gòu)成是免費(fèi)的。想要教育人們關(guān)于健康，安全，或者其它一些影響公共福利的問(wèn)題。
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