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So far nobody has provided ______ hard evidence to support their claim that they have seen _______ UFO.
A.an; aB.the; theC.不填;aD.不填;an
C

试题分析:考查冠词用法。第一空的evidence是不可数的抽象名词证据,单独使用不要冠词;第二空用a/an+单数名词表示一类事物。因为UFO是辅音发音,所以使用a。句意:到目前为止,没有人能提供有力的证据来证明他们看见过UFO。故C正确。
点评:冠词的考查集中在the表示特指,a/an表示泛指;以及冠词的一些固定搭配和不或死于冠词的情况,如抽象名词,物质名词前面不要使用冠词。
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