—Sam, come downstairs, please. I need yo...

—Sam, come downstairs, please. I need your help.

—Sorry，mum. I on the phone..

A．am talking

B．talked

C．was talking

D．have talked

A 【解析】难度适中，考查现在进行时，Sam不能去帮他妈妈，他正在谈电话，答案选A，B是一般过去时，C是过去进行时，D是现在完成时。

考点分析：

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