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举一反三
【简答题】PSAs are often run___1___ (免费), and are intended to educate people about health, safety, or any other issue which affects ___2____(公共福利).
【单选题】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
【单选题】PSAs are often run for free, _____ to educate people about health, safety, or any other problem that affects public welfare. [ ]
A.
meaning
B.
meant
C.
to mean
D.
having meant
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