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791. 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 thay can be indistinguishable
C. so gradual that they are unable to be indistinguished
D. gradul enough not to be distinguishable
E. gradul enoughso that one cannot distinguish them
答案选A,而我选了C,OG对于C的解析是are unable to 是awkward verbiage,可以通过cannot更好的表达出来。但这个解释我个人认为很牵强,我认为C选项理解起来似乎并没有任何问题,请问C选项是否存在其他的问题呢?
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