According to some economists, the July decrease in unemployment so that it was the lowest in two years suggests that the gradual improvement in the job market is continuing.
so that it was the lowest in two years
so that it was the lowest two-year rate
to what would be the lowest in two years
to a two-year low level
to the lowest level in two years
A选项:the july decrease是名词,so that 不能用来修饰名词;it 指代不明确,可以是july decrease 或者unemployment
B选项:同理
C选项:to what would be 中的would使用有误,因为需要表示事实
D选项:表达有误,two year low level可以有多个意思,此处意思模糊
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