___ the people well , we must work hard at our lessons .

时间:2022-07-08 12:00来源:未知作者:admin 点击: 次

18. ___ the people well , we must work hard at our lessons . A. To serve B. Serving C. Served D. Having served

18. ___ the people well , we must work hard at our lessons .

A. To serve

B. Serving

C. Served

D. Having served

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