问题
选择题
________ we had read your letter _____the true state of affairs.
A．It was until… that we understood
B．It was not until…that we understood
C．Until …did not we understand
D．Not until… we understood`
答案
答案：B
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。