Trợ lý học tập AI - Câu trả lời này chỉ mang tính tham khảo
1. John said he couldn't chat because he was working at that moment.
2. David told me that his brother had written that book the previous year.
3. Jane informed us that she would be having dinner with Rachel the following day.
4. The students said that they had worked very hard that day and it had paid off.
5. Tom told me that he would see me there the next Friday.
The invention of the electric telegraph gave birth to the communications industry. Although Samuel B. Morse succeeded in making the invention useful in 1837, it was not until 1843 that the first telegr...
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