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___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.
| A．If, which | B．So long as, what | C．In case, where | D．Even if, as |
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___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.
| A．If, which | B．So long as, what | C．In case, where | D．Even if, as |
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