◎ 题干
---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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“---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…”主要考查了你对  【介词短语】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。