21.My grandfather has sent me _____ e-dog as my birthday present.

21.My grandfather has sent me _____ e-dog as my birthday present.

题目
21.My grandfather has sent me _____ e-dog as my birthday present.
何以见得,它是以元音音素发音的?那么又该以什么来判断的?
选a还是an?
答案
My grandfather has sent me an e-dog as my birthday preset(e-dog它是已元音音素发音的.所以一定填AN)
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