问题描述：
the experiment may take a few days to finish,but it's worth__it.
A.carring out B.sustaing C.devoting D.keep at
答案怎么回是D?be worth +doing的不是么?
A.carring out B.sustaing C.devoting D.keep at
答案怎么回是D?be worth +doing的不是么?
问题解答：
我来补答展开全文阅读