____on the project for 10 years ,he still felt it hard to make any achievementsa.he worksb.having worked c.he having workedd.working正确的选什么?并一个个解释一下为什么其他3个不行,都错在了那里?

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____on the project for 10 years ,he still felt it hard to make any achievementsa.he worksb.having worked c.he having workedd.working正确的选什么?并一个个解释一下为什么其他3个不行,都错在了那里?

____on the project for 10 years ,he still felt it hard to make any achievementsa.he worksb.having worked c.he having workedd.working正确的选什么?并一个个解释一下为什么其他3个不行,都错在了那里?
____on the project for 10 years ,he still felt it hard to make any achievements
a.he works
b.having worked
c.he having worked
d.working
正确的选什么?并一个个解释一下为什么其他3个不行,都错在了那里?

____on the project for 10 years ,he still felt it hard to make any achievementsa.he worksb.having worked c.he having workedd.working正确的选什么?并一个个解释一下为什么其他3个不行,都错在了那里?
B
主句和从句主语一致 省略其中一个主语!动词加ing .---主语一致的语法点
have done 表示完成语气用在此处比较合适

B.十年了,用完成时,主句发出动作为主动用ing开头。