Some of the scientists assert that there is ______ UFO in the world.

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问题 Some of the scientists assert that there is  ______  UFO in the world.

选项 A、no such thing as
B、no such thing as an
C、no such a thing as a
D、no such thing as a

答案D

解析 这里主要是搭配的问题。词序应该是no such thing (s)。后面无论是跟单数名词还是复数名词,名词前面都不用加冠词。而这里介词as后面的冠词应该是a,因为后面的单词UFO是辅音U开始的缩写。
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