摘要：23．To do a bit for the motherland, . A．working hard is necessary B．to learn a foreign language is needed C．it is important to master science D．one should serve the people whole-heartedly
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To do a bit for the motherland, ________
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A．working hard is necessary
B．to learn a foreign language is needed
C．it is important to master science
D．one should serve the people whole heartedly