The number of these families has increased by 40 percent in the past ten years.A.在过

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The number of these families has increased by 40 percent in the past ten years.

A.在过去十年里,该类家庭增加到40%。

B.在过去十年里,该类家庭提高至40%。

C.在过去十年里,该类家庭增长了40%。

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