單項(xiàng)選擇。

--Hi, Nancy, you look tired.

--I am tired. I ________ on the novel all day.

[　　]

A．worked
B．had worked
C．have been working
D．have worked

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科目：高中英語 來源： 題型：014

單項(xiàng)選擇。

--Hi, Nancy, you look tired.

--I am tired. I ________ on the novel all day.

[　　]

A．worked
B．had worked
C．have been working
D．have worked

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