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You __________ to leave until you __________ your work.   
A．won’t be allowed; have finishedB．won’t allow; finish
C．won’t be allowed; will finishD．won’t allow; will finish
A
句意：一直到你完成工作才可以離開。前一空表示被允許，因此用被動語態(tài)；后一空和前一空存在邏輯上的先后順序，因此用現(xiàn)在完成時態(tài)。
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