08 语法笔记讨论 be able to be done结构

LuLuanna

Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
A. so gradual as to be indistinguishable
B. so gradual so that they can be indistinguishable
C. so gradual that they are unable to be distinguished
D. gradual enough not to be distinguishable
E. gradual enough so that one cannot distinguish them



Q：  be able to be done 这个为什么不对啊

Fiona09

这个结构比较奇怪，C项错是因为把重心偷转到了"讨论economic shifts有没有被识别这个能力"，而合理的含义重心是"我们能否识别economic shifts“。

LuLuanna

Fiona09 发表于 2017-8-2 15:21
这个结构比较奇怪，C项错是因为把重心偷转到了"讨论economic shifts有没有被识别这个能力"，而合理的含义重 ...

嗯嗯，我理解你的意思，be able to be done 这个结构本身就是错的吗，还是说用在这里转移了句子重心所以才错了呢