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问题: Shirley sent him ( )to explain the reason why she

couldn't go to his birthday party

A.one letter or the other
B.a letter after the other
C.letters after letters
D.letter after letter

thanks

解答:

选 letter after letter ,
意思是一封又一封的信
这在英语中是名词的固定用法
名词加一个介词在加这个名词
例如
day after day
tree after tree