Don't jump to a conclusion! Let's _______ the problem first.
A：to discuss
B：discuss
C：discussed
D：discussing
Amy: What time is it now, John?
John: It's 10:10. It's time for maths class.
John has maths class at____.
I'll come on ____ that my parents are invited, too.
解方程的过程中正确的是（ ）．
