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---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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