小问题请教牛牛们~

蚊子小猴

Despite recent increases in sales and cash flow that have propelled automobile companies' common stocks to new highs, several industry analysts expect automakers, in order to conserve cash, to set dividends more conservatively than they were
A. to set dividends more conservatively than they were
B. to set dividends more conservatively than they have been
C. to be more conservative than they have been in setting dividends
D. that they will be more conservative than they were in setting dividends
E. that they will be more conservative than they have been to set dividends
答案C
这是prep语法笔记183题  这道题的解释中有这么一条
比较结构的比较对象要平行：no alternations，no tense changes，no nothing(unretriviable omission)。   其中no tense changes我有疑问哎~很多地方比较前后时态都是不一样的啊~

小安安要乖

这个主要是谓语不一样，时态算比较弱的错误吧

lonelyorchid

时态当然可以不一样，不然怎么在时间顺序上进行比较呢？
针对本题，最重要的问题是they的指代，到底指代dividents还是automaker

蚊子小猴

恩~ 我也觉得  在比较结构中时态不一样的例子比比皆是~欧了 谢谢楼上and楼上上！