this is an onion and that is --- beef 横杠上添a an 还是/

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this is an onion and that is --- beef 横杠上添a an 还是/

this is an onion and that is --- beef 横杠上添a an 还是/
this is an onion and that is --- beef 横杠上添a an 还是/

this is an onion and that is --- beef 横杠上添a an 还是/
a
a/an由冠词后单词的音标的首音节是否为元音决定,不是就a,是就用an

不填
beef是不可数名词

a