prep2008 183 比较时态用法

有理想没有钱

Despite recent increases in sales and cash flowthat have propelled automobile companies' common stocks to new highs, severalindustry analysts expect automakers, in order to conserve cash, to setdividends more conservatively than they were
A.    to set dividends moreconservatively than they were
B.    to set dividends moreconservatively than they have been
C.    to be more conservativethan they have been in setting dividends
D.    that they will be moreconservative than they were in setting dividends
E.    that they will be moreconservative than they have been to set dividends


请问下能够解释下ABC的取舍吗，我看语法笔记上说的也不是很清楚，在比较语句中，一般都是考察比较对象也就是主语前后是否弄错，但是这题确实检查时态是否一直，但是一般比较都是比较前后2哥时间，比如过去和现在，但是这题的PREP语法笔记上却说要时态一直，下面列出啦笔记的解释，我不是很懂，请好心人继续详细解析下这题，谢谢。。。。
A.    实义动词to set(表达预测，将来时)与系动词were不平行，应该是: to set Div. moreconservatively than they have done.

B.    to set与have been不平行，要在been后面加上setting或改为have set以修正平行。
C.    Correct；be + adj + in doing something很顺口, e.g. She is veryactive in posting questions on CD.；时态也很好：to be表示从现在开始的未来，have been 从过去到现在，时间轴上没有空缺
D.   Expect sb. that搭配错误，只能用expect that或expect sb. to do；were的时态问题
E.    不能用Expect sb. that，同D； to set错误，应该改为in setting

泾渭不凡

这个。。。这个主要不是时态的比较排除错误选项的，是根据谓语形式比较要一致排除的吧~
首先是expect sb to do排除D&E。
谓语动词比较的时候要注意谓语动词要一致：A be  more B be; A do sth more than B do.
A&B不符合该条规则哎~

这里再引用一下aeo斑斑在其他贴纸里面对该题中C和B选项的剖析啊~对理解有帮助。
Aeo: ...they have been后面不用补任何动词，been就是动词了，与前面的be more conservative里面的be遥相呼应。有more...than结构的限定，必然they have been不会跑去跟several industry analysts expect并列。they是指automakers.
B的错误在于been没有并列对象，要用也用done，而且done可以省略，直接用than they have.
但是从逻辑上讲，用状态be比用动作set要好，当然这要根据语感来体会了。