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 houseworkB have done houseworkC did houseworkD have been doing housework
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祝学习进步B选项，他从早上做到说话之前刚刚完成 这样理解不也行么这个真不适合，和后面since this morning完全不匹配