In my opinion, this is not an economical way to get more water; , it is very expensive. A

发布时间：2020-08-16 10:36:41

      In my opinion, this is not an economical way to get more water;     , it is very expensive.
A. on the other hand
B. on the contrary
C. in short
D. or else

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A. on the other hand
(答案→)B. on the contrary
C. in short
D. or else
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