Heating-oil prices are expected to be higher this year
than last because refiners are paving about S5 a
barrel more for crude oil than thev were last year. (A) Heating-oil prices are expected to be higher this
year than last because refiners are paying about
$5 a barrel more for crude oil than they were (B) Heating-oil prices are expected to rise higher
this year over last because refiners pay about
$5 a barrel for crude oil more than they did (C) Expectations are for heating-oil prices to be
higher this year than last year's because refiners
are paying about $5 a barrel for crude oil more
than they did
（D）It is the expectation that heating-oil prices will be
higher for this year over last because refiners
are paying about $5 a barrel more for crude oil
now than what they were(E) It is expected that heating-oil prices will rise
higher this year than last year's because refiners
pay about $5 a barrel for crude oil more than
they did
这道题，我纠结的是，A中的they were的而不是they did的理由
我参照了曼哈顿里面提到的有关助动词代替动词或动词短语的规则，但仍有疑问，想请各位高手讲解一下，多谢！
1、这里首先确实是没有理由用did，如果要用是不是也应该是they paid?因为曼哈顿里面提到如果说要改变时态，那么这种情况下就要重复前面的整个动词
2、而这里的were是和前面的are想对应，但是曼哈顿又说了，一般后面用助动词来代替动词或动词短语，助动词的时态应当是与前面助动词的时态一致的，这里虽然都是进行时，但是有过去和现在之分。
以上两点是我现在能够想到的两个理由，但是我不能确定，请多指教！
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发表于 2014-7-20 19:48:48
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