Question

The teacher said to the students,“You ________ your homework yesterday but none of you did so.”

[　　]

A．should finish

B．must finish

C．ought to do

D．should have done

Answer 1

答案：D
解析：

should have done表示“本该做而没有做的事情”，而shouldn't have done表示“本来不该做而做了的事情。”