i was listenning to () wonderful piece of music when there was() knock on the doorA a ;an B /;a C a;a D the;the
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i was listenning to () wonderful piece of music when there was() knock on the doorA a ;an B /;a C a;a D the;the
i was listenning to () wonderful piece of music when there was() knock on the door
A a ;an B /;a C a;a D the;the
i was listenning to () wonderful piece of music when there was() knock on the doorA a ;an B /;a C a;a D the;the
C 特指的时候用the 后接元音的时候用an 其他时候用a
这里有个固定词组:a piece of
C a;a
a piece of music
I heard footsteps, then a knock on the door.
我听到脚步声,随后是敲门的声音。
There was a knock on the door and a large stoutish man stepped in.
门上敲了一下,一个身材魁梧、略为发...
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C a;a
a piece of music
I heard footsteps, then a knock on the door.
我听到脚步声,随后是敲门的声音。
There was a knock on the door and a large stoutish man stepped in.
门上敲了一下,一个身材魁梧、略为发胖的男人走了进来。
He suddenly heard a knock on the door. He opened the door and saw an attractive girl standing outside of his house .
突然间他听到敲门声,他去开门,看见了一位美丽动人的女子站在他的房门外。
a knock on the door 有a的。
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选C
C
C
C,都是可数的,所以都用a