问题描述：
---You’ve dropped _____ “s’’ in the word “across’’.
---Oh,____ letter “s’’ should be doubled like this “across’’.
A.a ,a B.an ,a C.an ,the D.the ,the 为什么选C,
---Oh,____ letter “s’’ should be doubled like this “across’’.
A.a ,a B.an ,a C.an ,the D.the ,the 为什么选C,
问题解答：
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