Female pandas usually have one or two babies .A. at times 　　B. at onceC. at all timesD. a

Female pandas usually have one or two babies .
A. at times 　　
B. at once
C. at all times
D. at a time

A. at times 　　B. at onceC. at all times(答案→)D. at a time解析：根据语境可知此句的含义是雌性大熊猫通常一次生一个或两个的婴儿。此题考查的是对语句的正确理解，根据选择项的提示可知A表示有时，B表示立刻，马上C表示随时D表示在一次，故选D。

感谢回答，我学习了