摘要： - Mum, I have got a headache. - You’d better go out and take a walk. You in front of the TV too long. A. sit B. are sitting C. have been sitting D. sat

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—Mum, I have got a headache.
— You’d better go out and take a walk. You       in front of the TV too long. 

[     ]
A. have been sitting
B. are sitting
C. sit
D. sat
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