是这样的：
严格意义上说,by后面可以加任何时态,只有since必加现在完成时.
只是说这句话中过去完成时会更严谨一些,但现在这样也没错.
在IS中要追求完美,而在IE中则是得过且过,没有致命的问题就可以是E.
SAT很多题目最好摘抄下来自己体会体会,培养语感,否则经常这题懂了的方法运用到下一题又错了.
sat语法问题 Although familiar to us from representions in ancien
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