y表示在……时间之前,通常与完成时连用.
完成时除非加BY否则不加具体时间.如果你用AT就不能跟完成时连用了.
随便买本词语辨析,这里介词的用法中考中可是很重要的.
“He had already posted the letter by five yesterday.”为什么要用介词
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