问题
选择题
— Do you know mother giant pandas have only one or two babies ______ ?
— Sorry, I don't know. [ ]
A. at a time
B. at time
C. at times
D. at that time
答案
答案：A
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— Do you know mother giant pandas have only one or two babies ______ ?
— Sorry, I don't know. [ ]
A. at a time
B. at time
C. at times
D. at that time
答案：A