you see,my mum promised to buy me ___ MP4 for my birthday.---oh,really?but how i wish i could listen to music____MP3 a:an ;on b:a ;over c:a ;by d:an;with 请说明为什么选的原因和其他选项不可以的原因,
问题描述：
you see,my mum promised to buy me ___ MP4 for my birthday.
---oh,really?but how i wish i could listen to music____MP3
a:an ;on
b:a ;over
c:a ;by
d:an;with
请说明为什么选的原因和其他选项不可以的原因,
答
A
MP4 的M 发间是原音开始的,所以用an
用MP3听歌要用on的.