After the first man landed on the moon in 1969, the scientists thought hotels would have been built on the moon by the year 2000.

【提醒网友】句子要注意大小写和不要漏掉标点。

网友的判断是对的！本句应该使用“过去将来完成时”。

过去将来完成时，主要用于以过去某时间点为参照，表示到过去的某一时刻，将要完成的动作或状态。又如：

（1）My husband said he would have come back by the end of next year.

我丈夫说过他明年年底就会回来的。

（2）I was sure that we would have solved the dispute by that time.

我确信到那时我们就已经解决这个争端了。

网友的句子，跟以上两句非常相似。对比如下：

问题句：landed in 1969 （过去某时间点为参照），would have been built by the year 2000（到过去的某一时刻，将要完成的动作或状态）

例句1：My husband said（过去某时间点为参照），would have come back by the end of next year（到过去的某一时刻，将要完成的动作或状态）

例句2：I was sure（过去某时间点为参照），would have solved the dispute by that time（到过去的某一时刻，将要完成的动作或状态）