Recovering uranium from seawater 本身就是 try to 的宾语了。 这个do多余。
不过E答案不好,主语过长,比较起来还是A最好了
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觉得楼上解释有问题,还有人能说说E不好的原因吗?
E is wordy. Just "worthwile to try someday" is ok,For C, I also think "trying" is not properate here.
ding
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