题目内容

---Do you know mother giant pandas have only one or two babies    ?
----Sorry，I don’t know．
A．at a timeB．at timeC．at times D．at that times
A

试题分析: 句意：你知道大熊猫妈妈一次只生一个或两个宝宝吗？对不起，我不知道。at a time一次，at time无此短语，at times有时，偶尔，at that times无此短语。giant pandas大熊猫，have分娩。根据语境可知是一次生一个或两个宝宝，故选A
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