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题目材料：
For each year, the total typical travel time is the sum of the typical time for the morning commuting hours and the typical time for the evening commuting hours. According to the data, which of the following years had the greatest increase in the total typical travel time from the preceding year' s total?
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A.1986
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B.1987
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C.1988
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D.1989
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E.1990
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