______ over and over again, but he still couldn’t understand

______ over and over again, but he still couldn’t understand.

A．Having explained	B．Having been explained
C．Explaining	D．It had been explained

享受着幸福 1年前已收到1个回答举报

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共回答了21个问题采纳率：85.7% 举报

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。

1年前

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