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题库 / OG2017V-SC-263
In the textbook publishing business, the second quarter is historically weak, because revenues are low and marketing expenses are high as companies prepare for the coming school year.
low and marketing expenses are high as companies prepare
low and their marketing expenses are high as they prepare
low with higher marketing expenses in preparation
low, while marketing expenses are higher to prepare
low, while their marketing expenses are higher in preparation
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higher没有比较对象，排除c,d,e
b, they找不到指代对象
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