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题目内容
（国家开放大学-开放英语4）
I think this sofa is ___ than that one.
选择一项：
a.
expensiver
b.
more costly
c.
cost more
d.
costlier
选择一项：
a.
expensiver
b.
more costly
c.
cost more
d.
costlier
参考答案