Question

My friend John insisted that he had seen ______ alien the day befor

My friend John insisted that he had seen ______ alien the day before. A．a B．an C．some D．any

Answer 1

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。