---We’d like a double room with a view , please.---I’m sorry, but all double rooms with a sea view _____________already.A.were reservedB.had been reservedC.have been reservedD.have reserved
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C解析考察时态和语态。Already通常与完成时连用，结合句意可知使用被动语态，故C正确。句意：所有的海景双人房都已经被预定了。