It was not until the teacher had explained it three times _______ how to work out the problem.A．did he understandB．had he understoodC．that he understoodD．that h-高中英语-n多题

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It was not until the teacher had explained it three times _______ how to work out the problem.

A．did he understand	B．had he understood
C．that he understood	D．that he didn’t understood

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