A. could have beenMost of the tourists felt rather disappointed at their travlling abroad. They said that it could have been better organized.大部分游客对他们的海外游很失望。他们说（他们的行程）本来是可以（被）组织得更好。这是一个虚拟语气的句子，could have been better organized 本来能够（被）组织得更好，但是实际上没有，假设的情况和过去已经发生的实际情况相反。比如：You should have told me. 你本来应该告诉我的。（但是实际上没有）...
