However in _______ recent years, _______ Niagara Falls have come to be appreciated more for their beauty as _______ wonder of nature.

A. the; x; a　　　　 B. the; x; the 　　　　 C. x; the ; x 　　　　　 D. x; the; a

However, in ______ recent years, Niagara Falls have come to be appreciated more for their natural beauty as ______ wonder of nature.

   A. 不填; a        B. the; the       C. 不填; the       D. the; a

However, in ______ recent years, Niagara Falls have come to be appreciated more for their natural beauty as ______ wonder of nature

1. A.
   不填; a
2. B.
   the; the
3. C.
   不填; the
4. D.
   the; a

However, in ________ recent years, _________ Niagara Falls have come to be appreciated more for their natural beauty as _________ wonder of Nature.

 A. /; the; a      B. the; /; the   C. /; the; /      D. the; /; a