So far nobody has provided ______ hard evidence to support their claim that they have seen _______ UFO.


  1. A.
    an; a
  2. B.
    the; the
  3. C.
    不填；a
  4. D.
    不填；an
C
試題分析：考查冠詞用法。第一空的evidence是不可數(shù)的抽象名詞證據(jù)，單獨使用不要冠詞；第二空用a/an+單數(shù)名詞表示一類事物。因為UFO是輔音發(fā)音，所以使用a。句意：到目前為止，沒有人能提供有力的證據(jù)來證明他們看見過UFO。故C正確。
考點：考查冠詞辨析
點評：冠詞的考查集中在the表示特指，a/an表示泛指；以及冠詞的一些固定搭配和不或死于冠詞的情況，如抽象名詞，物質(zhì)名詞前面不要使用冠詞。
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    2. B.
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    3. C.
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    4. D.
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