题目内容

We didn’t start our discussion _____ everybody arrived.
A．sinceB．ifC．whileD．until
D
考查点：not…until…的用法。 解题思路：not…until表示“直到……才……”,句意为“直到每个人都到齐了我们才开始讨论。”since表示“自……以来；既然，由于”；if表示“如果”表假设关系，while“虽然，当……时候”，均与句意不符；
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