He had already posted the letter ____five yesterday.A.on B.at C.by D.for 此题应该选C,

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He had already posted the letter ____five yesterday.A.on B.at C.by D.for 此题应该选C,

He had already posted the letter ____five yesterday.A.on B.at C.by D.for 此题应该选C,
He had already posted the letter ____five yesterday.
A.on B.at C.by D.for 此题应该选C,

He had already posted the letter ____five yesterday.A.on B.at C.by D.for 此题应该选C,
对,表示在那个时间前用by

at
表示时间,用AT ,所以选B
意思是昨天下午5点……

c 过去完成时,by表示在......之前

c 过去完成时,by表示在......之前