However, in recent years, Niagara Falls have come to be appreciated more for their natur

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

(答案→)A. 不填; a B. the; theC. 不填; theD. the; a解析：in recent years近年来；a wonder of nature自然界的一个奇迹。

这个答案应该是对的

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