Question

16. Dad has given up smoking, saying he just did        . ten years ago. (do)

爸爸戒烟了，说自己只是做了十年前就该做的事。

Answer 1

16. what he should / ought to have done考查虚拟语气和宾语从句结合的用法.，从全句来看，本句考查的是以what引导的宾语从句，且本题表述的就是对原来发生的事实进行虛拟，因此用what he should / ought to have done。类似用法还有：should / ought to have done本该做，而实际上未做5shouldn't / oughtn't to have done本不该做，而实际上做了；could have done本来能做，而实际上未做；needn' t have done本不必做, 而实际上做了；may / might have done过去可能做过/发生过。