29. Buttons have been used as ornaments ______.
(A) on and off throughout their history
(B) before the 13th century
(C) since the 14th century
(D) only in modern times

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統計： A(95), B(60), C(50), D(2), E(0) #938399

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#3986157
Yet it is very proba...
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#7334292
這題考查的是閱讀測驗中的資訊歸納與時間...
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#5380075

Yet it is very probable that buttons started life as ornaments; certainly it is not known that they had any practical function until the 13th century. 

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