一道英语时态问题
问题描述：
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
答
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