问题

Students should learn how________problems.
A:solve
B:to solve
C:solving
D:solved;
B:to solve
C:solving
D:solved;
正确答案是:
同类题型
I can’t believe what he says because he is _______ changing his mind
It is unreasonable to stick with small commercial banks whether they offer the best deal
In autumn, leaves turn yellow and _________ the trees.
This pair of shoes _______ really big for me.— Why not try another _______
In winter, many students like having soya milk and____ hot drinks.