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
D表示一个持续的时间段
E表示一个时点
句子的意思是在某个时点达到的最低点 所以选E
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