题文
－Sir，may I borrow some new books?
－Sorry，you can't________you haven't turn back those you borrowed one month ago.
| A．unless | B．before | C．because | D．until |
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－Sir，may I borrow some new books?
－Sorry，you can't________you haven't turn back those you borrowed one month ago.
| A．unless | B．before | C．because | D．until |
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