题目内容：

-We'd like a double room,please． -I'm sorry．All but one single room with sea view
A.have been reserved
B.were reserved
(为什么用完成时态)

优质解答

动作发生在过去,但对现在产生了影响,就应该用现在完成时.
所有的双间都被预定了,...言外之意就是 你现在订不到了..
类似 Is XiaoMing with you
No,he has left.