一些词形,填词类的问题
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第一问：
You mustn't play on the word,___ you？
答案居然是mustn't，我深深地觉得应该是must。
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第二问：
He likes to do thing _____(different) from others.
答案是differently，但我觉得应该是东西不同。另外请问有do differently from sb这种用法么？