()because only one baby panda is born to a mother each year,giant pandas are becoming rare in the world
问题描述：
()because only one baby panda is born to a mother each year,giant pandas are becoming rare in the world
a probably
b the reason
c it might been
说说别的不是的原因
答
答案：A
解析：the reason一般不和because连用的；C的形式不对,might是情态动词,后面应该用动词原形,不能用过去分词.