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---Since he works hard day and night , I’m sure he will make great progress soon. --- Yes. As the sa...
题目内容：
---Since he works hard day and night , I’m sure he will make great progress soon.
--- Yes. As the saying goes, _________.
A. work has a bitter (苦的) root but sweet fruit
B. a bad workman always blames his tools
C. everything must have abeginning
D. never too old to learn
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