问题
Public service advertisements are often run _____ free, and are ______ to educate people about health, safety, or any other issue which affects public welfare
A:for, mean
B:for, meant
C:of, to mean
D:in, meaning
B:for, meant
C:of, to mean
D:in, meaning
正确答案是：
同类题型
MrJohnson insisted that he _____ his debts, but nobody believed him
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I must go there earlier. John has suggestedthat I ________ an hour before the discussion begins.