print '题目：国庆节是几月份的？ \n A. 3月 \n B. 4月 \n C. 9月 \n D. 10月'
answer = raw_input ('please input your answer: \n')
'''
if answer == 'D':
    print 'Right!'
elif answer =='A':
    print 'Wrong!'
elif answer =='B':
    print 'Wrong!'
elif answer =='C':
    print 'Wrong!'
else:
    print 'please input the Right answer: /n'
'''
while answer != 'D':
    print 'please input the Right answer:'
    answer = raw_input ('')
