Mom, have a rest please. You______in the kitchen ever since you came home.

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问题 Mom, have a rest please. You______in the kitchen ever since you came home.

选项 A、had worked
B、were working
C、have been working
D、would work

答案C

解析考查动词时态。由since可知妈妈一直在厨房忙碌，该动作从过去一直持续到现在，可能还会继续进行下去。故选用现在完成进行时态。所以正确答案是C。

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