1.I wonder how he ___that to the teacher,

1.I wonder how he ___that to the teacher,
A dared say B dare saying C not dare say D dare to say
,可是dare做助动词的话怎么会有ed呢?
2,You can do it if you want to,but in my opinion it's not worth the effort it involves.
involve 在此句中的解释怎样更合理?“涉及”的话怪怪的.
3,You can hardly imagine what the old lady had to ___in the war.
A go through B go over C go on D go with
请翻译四个选项中短语的意思.