_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢?

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_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢?
_____scores of times,but he still couldn't understand it.
A.Having explained
B.Having been explained
C.Though it was explained
D.It was explained
为什么不选B呢?

_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢?
D
因为后面用了but,所以前面的句子一定要是一个独立的句子,只有D是一个独立的句子.

have been explained貌似是被动的啊解释的话你是主动方，你解释给他听，要选A。 C的话是though 和but不能同时出现，D项it指代不明，主谓宾混用了。

意思不通

_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢? times of you nine times out of at different times of a bunch of times during times of at times of in times of trouble为什么室times 翻译 Times of your life . in times of difficulty是什么意思 seven out of ten times the times of your life nine times out of ten The Best Of Times 歌词 Rain Of The Times 歌词 keep abreast of the times 翻译：In times of stress hundreds of time / hundreds of times