—Madam, may I borrow this famous book The Wandering Earth? —I'm afraid you can't, __________ you have a special card.

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1. (2021九上·温州开学考) —Madam, may I borrow this famous book The Wandering Earth?
—I'm afraid you can't, __________ you have a special card.

A . if B . so C . unless D . because

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