Question

It was playing computer games that cost the boy plenty of time he ________ doing his lessons．

[　　]

A．might have spent

B．ought to have spent

C．must have spent

D．could have spent

Answer 1

答案：B
解析：

考查的是虚拟语气的有关用法。Ought to/should＋have＋p．p表示“本来应该做却没有做到的事情”，有责备的含义。