used to be过去的样子
不用被动排除BC
it指代life选D那A呢，为什么不选Ait指代life, that没有这个功能.
with new inventions coming out,life in the future will become much easier than___
with new inventions coming out,life in the future will become much easier than___
Athat used to be Bit is used to C it was used to be Dit used to be 为什么选D
Athat used to be Bit is used to C it was used to be Dit used to be 为什么选D
英语人气：482 ℃时间：2020-02-05 11:47:33
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