The invention ______ she spent two years will do good to the world.

The invention ______ she spent two years will do good to the world.
A.whichB.thatC.on whichD.when
选什么啊?讲一讲,谢谢!
英语人气:911 ℃时间:2019-10-11 19:38:42
优质解答
选择on which,spend some time on something,是词组
将on 提前,与which组合,做invention的定语
也可以是这样the invention which she spent two years on will do good to the world.
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