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【单选题】
从效率的角度来看,公共产品最适规模所应满足的条件为A.
社会边际效用等于产品边际成本
B.
每个人的边际效用等于其边际成本
C.
社会边际效用等于每个人的边际效用
D.
社会边际效用等于每个人的边际效用之和
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【简答题】_________ I am! I've forgotten to post your letter. A. What forgetful a creature B. How forgetful a creature C. What a forgetful creature D. How a forgetful creature
【单选题】I’ve already forgotten ___________ you put the dictionary.
A.
that it was where
B.
where it was that
C.
where was it that
D.
that was it that
【多选题】I haven’t seen her for _.I’ve forgotten what she looks like.
A.
so long
B.
so long time
C.
a such long time
D.
such a long time
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