问题：
We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China
these months.
[ ]
A. nineteen
B. ninety
C. nineteenth
D. ninetieth
We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China
these months.
B. ninety
C. nineteenth
D. ninetieth
these months.
[ ]
A. nineteen B. ninety
C. nineteenth
D. ninetieth
参考答案：