题目内容

My friend John insisted that he had seen ______ alien the day before.
A．aB．anC．someD．any
B
本题的含义是我的朋友约翰坚持说以前他看见过外星人，修饰可数名词单数通常用不定冠词a或an，元音音素前用an，alien的第一个音为元音，故本题选B。
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