问题
选择题
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
答案
答案：A
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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
答案：A