scores of times , but he still couldn’t understand it . [ ]A.Having explained B.
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![scores of times , but he still couldn’t understand it . [ ]A.Having explained B.](/pic/43_1439899.jpg)
_____ 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
试题答案
D