[练习册] TN-17-SC

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In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly six hours a week.
  • chores; by 1997 they had spent nearly six hours a week
  • chores; by 1997 that figure had grown to nearly six hours a week
  • chores, whereas nearly six hours a week were spent in 1997
  • chores, compared with a figure of nearly six hours a week in 1997
  • chores, that figure growing to nearly six hours a week in 1997
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