虚拟语气问题非诚勿扰啊1.He sat with the door open all the time so that

虚拟语气问题
非诚勿扰啊
1.He sat with the door open all the time so that he __hear the footsteps as they entered the house
a.can b.may c.should d.might
2.i wish it ____spring all the year round in my city.
a.were b.is c.should be d.would be
3.-----Did you scold him for his carelessness?
-----yes,but ______it.
a.i`d rather not to do
b.i`d rather not have done
c.I shouldn`t do
d.I`d rather I haven`t done
4.he must be in the classroom,______he?
a.can`t
b.mustn`t
c.isn`t
d.must
请写出理由