______ over and over again, but he still couldn’t understand.A.Having explainedB.Having been explain

题目简介

______ over and over again, but he still couldn’t understand.A.Having explainedB.Having been explain

题目详情


______ over and over again, but he still couldn’t understand.
A.Having explainedB.Having been explained
C.ExplainingD.It had been explained
题型:单选题难度:偏易来源:不详

答案

D
本题考查时态。本题根据but he still couldn’t understand为过去时,故从句用过去完成时。句意:它解释了一遍又一遍,但他仍无法理解。

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