We had to wait half an hour we had already booked a table.A. sinceB. althoughC. untilD. b

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A. since
(答案→)B. although
C. until
D. before
解析：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”。