--_______ will the meeting last?
--_______ they reach an agreement.
A．How long; Not untilB．When; Not until
C．How long; UntilD．When; Until
C

試題分析：句意：會議要開多久？直到他們達(dá)成協(xié)議。對一段時間的提問常用疑問詞how long；until直到；not…until直到……才，但通常不用not until，所以選C。
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