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I _ all the cooking for my family,but recently i've been too

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I _ all the cooking for my family,but recently i've been too busy to do it.
A.will do B.do C.am doing D.had done
正确答案是B
为什么不选D呢,我认为D就是说过去为家里做饭,错在哪了呢?
I _ all the cooking for my family,but recently i've been too
不行.那样前后不成转折关系,可以填should have done 应该填do一般是表经常性 习惯性的动作我经常给家人做饭 但最近我太忙了(没能给他们做饭)