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( ).-- I wonder what this beautiful dress____?--Silk.

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( ).-- I wonder what this beautiful dress____?--Silk.
A.made of B.is made of C.made from D.is made from
(求答案及解析)
B is made of
辨析:be made from 由...制成(看不出原材料)
be made of 由.制成(能看出原材料)