When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.
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Athere are less than one-quarter that many
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Bthere are fewer than one-quarter as many
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Cthere are fewer than one-quarter of that amount
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Dthe number is less than one-quarter the amount
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Eit is less than one-quarter of that amount
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