（不知为何不能发新话题 我只好用投票发表）请问什么是run on sentence？内有GWD例句求解答

a336000

GWD6-Q22:  

Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore refused to carry even a pound of mail, despite being offered $1,000 to do so.

1. Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore
2. When Charles Lindbergh was attempting his solo transatlantic flight, being very reluctant to have any extra weight on his plane, he
3. Since he was very reluctant to carry any extra weight on his plane when he was attempting his solo transatlantic flight, so Charles Lindbergh
4. Being very reluctant to carry any extra weight on his plane when he attempted his solo transatlantic flight was the reason that Charles Lindbergh
5. Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh

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 正确答案是E ，我知道为什么选E 但是就不知道为什么说A是Run-on sentence

a336000

正确答案是E ，我知道为什么选E 但是就不知道为什么说A是Run-on sentence