Not until I read your letter ________ the true state of the

Not until I read your letter ________ the true state of the affairs.

A．did I understand	B．had I understood
C．I understood	D．I had understood

cypt 1年前已收到1个回答举报

罗马小子幼苗

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A

考查倒装。否定结构Not until置于句首时，主句要用部分倒装，由此可以排除C、D两项；此外，understand这一动作和“read”几乎是同时发生的，都发生在过去的某个时间，因此用一般过去时态。故A项正确。

1年前

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