Question

----How could I thank you enough? ----Don’t mention it. Any other man ____it

A. must do B. could do C. would have
done D. should have done

Answer 1

must do 必须做的

could do 也许会做的

“would+have+done”虚拟语气，表示对过去事情的假设，意思是“本来会做”。

hould have done “should + 动词的完成式”表示本应该做而实际上没有做,它的否定形式表示某种行为本不该发生但却发生了。有责备的意味。

选B

Answer 2

你好。答案是C
Any other man would have done it too. （这是虚拟语气句子的省略形式）
=== Any other man would have done it, too , if they had seen it / had had the opportunity / had been here / there .