og207

207. 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.

(A)  low and marketing expenses are high as companies prepare

(B)   low and their marketing expenses are high as they prepare

(C)  low with higher marketing expenses in preparation

(D)  low, while marketing expenses are higher to prepare

(E)   low, while their marketing expenses are higher in preparation

红色部分改为现在进行时as companies are preparing for是否更恰当呢？？as表伴随，我觉得指明了时间，强调这段时间里公司正在干……

如果改为进行时， 感觉过于强调动作的时间性，显得时间很短，与前面要表达的状态(LOW...HIGHT..)的感觉不协调。

I saw him As he was getting off the bus. 正当他下公共汽车时, 我看见了他。

在本题，如果用进行时，句子的意思是：正当准备明年的。。。，费用是高的。

供讨论。

突然想到，as可不可以解释成“因为”？？