Could you tell me         a moment ago?

• A.what were they talking about
• B.what are they talking about
• C.what they were talking about
• D.what they are talking about

答案

正确答案：C

知识点：宾语从句  

此题同样从语序上，可以排除A、B；而从时态上“a moment ago”可知，要用过去时态，所以D不正确，只有C选项是正确的。

略

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