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We had to wait half an hour _______ we already booked a table.
A.sinceB.althoughC.untilD.before
B
although 引导让步状语从句,意为“虽然”,表示“虽然我们订了座位,但是我们不得不等半小时”。since意为“自从”;until意为“直到”;before意为“在……之前”。
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