问题
Have you any idea _______?
A:that how we can improve the English level within 4 months
B:that how can we improve the English level within 4 months
C:how can we improve the English level within 4 months
D:how we can improve the English level within 4 months
B:that how can we improve the English level within 4 months
C:how can we improve the English level within 4 months
D:how we can improve the English level within 4 months
正确答案是：
