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how do people go to work by bike,others _.a.aren't b.doesn't

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how do people go to work by bike,others _.a.aren't b.doesn't c.don't d'didn't
what's sally doing?
a.having great fun watch b.has great fun watching c.having great fun watching d.have great fun watches
选哪个,为什么?要原因.
how do people go to work by bike,others _.a.aren't b.doesn't
C
C have fun doing sth
再问: 那how do people go to work by bike, others _. a.aren't b.doesn't c.don't d.didn't是为什么啊?请指教。
再答: 前句说how do 用的是助动词do,后面要相应用do 的适当形式,又因为others是复数概念,只能用don't 而不是doesn't