一道英语时态问题I'm rather tired;I __ since this morning.A was doing

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一道英语时态问题
I'm rather tired;I __ since this morning.
A was doing housework B have done housework C did housework D have been doing housework
选哪个为什么

I'm rather tired;I __ since this morning.
我非常累,从早上到现在一直在做作业；
选D
A was doing housework B have done housework C did housework D have been doing housework
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再问： B选项，他从早上做到说话之前刚刚完成这样理解不也行么
再答：这个真不适合，和后面since this morning完全不匹配

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