Why is online learning so popular today?
It is convenient and time saving.
举一反三
内容
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Why is AI so popular and powerful these years? （ ）
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为什么今天诊所里有那么多人？ A: Why there are so many people in the clinic today? B: Why are there so many people in the surgery today?
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Why has techno music become so popular in Europe?
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14 Why is getting online learning cheaper?Because the students don’t have to pay ____costs.
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Rising prosperity is one of the reasons why we feel so time-pressed today