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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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A和D比，A是并列而D是转折，虽然文意上转折可能有优点，但是D有明显的语法错误－－－D中不能用higher！！没有对应的对象，而且应该改成 while marketing expenses to prepare for the coming school year are high.
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