问题补充：
Something has to be done to stop the rivers from being further polluted, ?
A. doesn’t it
B. hasn’t it
C. does it
D. has it
答案：
(答案→)A. doesn’t it
B. hasn’t it
C. does it
D. has it
解析：考查反意疑问句。Have/has/had to表示“不得不，必须”时，反意疑问句用don’t/doesn’t/didn’t。不定代词Something作主语，反意疑问句用it。故选A。
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