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【单选题】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
【简答题】Requirements: The use of mobile telephone has become more and more popular. However, some people think that despite its convenience.it often causes distces in public and interferes people's priva...
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