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单项选择题

The personnel manager makes it clear that for security reasons, no one is allowed to enter the building ______ presenting a photo ID card.

(A) unless
(B) without
(C) because
(D) if
相关考题

单项选择题 107, I'm happy to announce that we are ______ finished with the construction of a new factory, which we hope can be set in operation early next year.

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