last sunday afternoon,____ accident happened and many people were lost .A.a B.an C.the D.

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last sunday afternoon,____ accident happened and many people were lost .A.a B.an C.the D.

last sunday afternoon,____ accident happened and many people were lost .A.a B.an C.the D.
last sunday afternoon,____ accident happened and many people were lost .
A.a B.an C.the D.

last sunday afternoon,____ accident happened and many people were lost .A.a B.an C.the D.
B
元音开头用an ( 泛指)

B 表泛指 指有一个意外发生了