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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

21、D

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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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