D
本题考查介词含义的区别。本题的含义为自八点以来，你一直在看电视。该是你做作业的时候了。Since表示自从的含义，引导时间状语或时间状语从句，主语或主句通常使用完成时态，since符合本题的含义；而at用于时间前表示在的含义，for后跟时间长度，by后跟时间可以表示到……为止的含义，后三者与本题意思不符，故本题选D。
You’ve been watching _______ 8:00. It’s time to do your home
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