要用a还是an?
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要用a还是an?
要用a还是an?
要用a还是an?
a
要用a还是an?
a还是an uniform
用a还是an
是a还是an
an NBA还是a NBA
an mp5还是a mp4
useful前是加a还是an
a Australian还是 an Australian
an eraser 还是 a eraser
a还是an important person
a invitation还是an invitation
an UFO还是 a UFO
a egg还是an egg
a European还是an European
uniform前+a还是an
a aunt 还是an aunt
a man还是an man?
a object 还是 an object