34. The lake used to be polluted, but now something to make it clear again.A. is being don

发布时间：2020-08-16 06:17:49

34. The lake used to be polluted, but now something to make it clear again.
A. is being done
B. does
C. is doing
D. is done

网友回答

(答案→)A. is being done
B. does
C. is doing
D. is done
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