In order to look at sea life closely,people have to _____ some kinds of special equipment

In order to look at sea life closely,people have to _____ some kinds of special equipment

题目
In order to look at sea life closely,people have to _____ some kinds of special equipment
1.work in
2.work over
3.work out
4.work off
选几?希望能告诉一下含义.
答案
.
不是说了
work out 了么.
制造出撒
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