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.
_____scores of times,but he still couldn't understand it.
_____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?
A.Having explained
B.Having been explained
C.Though it was explained
D.It was explained
为什么不选B呢?
英语人气：736 ℃时间：2019-10-20 00:16:19
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