31 _____ the efforts of enthusiastic collectors at the turn of the century, few folk songs created by the native Taiwanese would have survived to the present days.
(A) If there have not been
(B) Had there not been
(C) If there was no
(D) Have there not had

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統計: A(49), B(168), C(33), D(14), E(0) #596911

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Had there not been= If there had not been
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