– How many babies can a mother giant panda have ? – One or two.A. one timeB. at a timeC.

– How many babies can a mother giant panda have ?
– One or two.
A. one time
B. at a time
C. at times
D. some time

A. one time(答案→)B. at a timeC. at timesD. some time解析：短语辨析。one time 一次，一度； at a time每次，在某时；at times有时，偶尔；some time在未来某时。句意；大熊猫妈妈能一次生几个孩子？一个或者两个。结合语境，可知指的是每次，故选B。

好好学习下