We had to wait half an hour _______ we already booked a table.
A．sinceB．a(chǎn)lthoughC．untilD．before
B
although 引導(dǎo)讓步狀語(yǔ)從句,意為“雖然”,表示“雖然我們訂了座位,但是我們不得不等半小時(shí)”。since意為“自從”；until意為“直到”；before意為“在……之前”。
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