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scoresoftimes,butDerekstillcouldn'tunderstandhowtousepastparticipleinaconcretesituation.A.HavingexplainedB.HavingbeenexplainedC.ThoughitwasexplainedD.Itwasexplained

题目详情
________ scores of times, but Derek still couldn't understand how to use past participle in a concrete situation.
A.Having explained
B.Having been explained
C.Though it was explained
D.It was explained
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答案和解析
D