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40． The average weekly wage near1y doub1ed in the l970' s， rising from ＄ 114 to ＄ 220， yet the average worker ended the decade with a decrease in what their pay may buy.
（A） with a decrease in what their pay may buy
（B） with what was a decrease in what they were able to buy
（C）having decreased that which they could buy
（D） decreasing in purchasing power
（E） with a decrease in purchasing power

问问啊，答案是E，可是为什么不选D呢？

D不好。

原題句意要表達的是: 工人購買力降低，以此結束了1970年代。但D中，就語法結構來說，decreasing 的主語不清，它可以指 the average worker，也可以指 decade；就語意層面來說，the average worker decrease in purchasing power 這種講法不佳，應該直接說 the purchasing power of the everage worker decreases，由purchasing power作主語，表達較簡潔。