________ we had read your letter _____the true state of affairs.A.It was until… that we understoodB.It was not until…that we understoodC.Until …did not we understandD.Not until… we understood`
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B解析这题考查强调句的用法：It’s not until…that…“直到…才”，句意是：直到我们读了你的信，我们才知道事情的真实情况。如果用not until在句首，从句需要倒装，所以D是错的。选B。