问题
选择题
---Who has made a mess in my room?
---Who else it but your naughty son?
A．could do
B．could have done
C．did
D．has done
答案
B
考查情态动词用法。语境表示对过去发生并延续到现在的情况的推测，用could have done表示不肯定的语气。
搜题请搜索小程序“爱下问搜题”
cosωt
