21、Everyone was so busy celebrating Tom’s birthday that they failed to notice how much they ________their neighbors.
A．had bothered B．would bother
C．have bothered D．were bothering
科目：高中英語 來源： 題型：
Everyone was so busy celebrating Tom’s birthday that they failed to notice how much they ________their neighbors.
A．had bothered B．would bother
C．have bothered D．were bothering
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