Now they are gone.We are all surprised that they

Now they are gone.We are all surprised that they ____ so soon.
a should leave b must have left
c must leave d should have left
选C 为什么?
不好意思，是选D

答案：D
分析：
1.Now they are gone.
意思是：他们已经走了.
be gone 是系动词 be + 过去分词,gone 表示离去,说明他们是在过去某个时间离开的.
2.We are all surprised that they ____ so soon.
意思是：我们都十分惊奇他们竟然会离开的那么早（言外之意他们本不该离开）.
根据上文提供的“他们已经走了”,推断出这里惊奇的是过去的一个事实.而对过去的虚拟应该用 should + have + 过去分词.

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