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Câu hỏi:
Wearable sensors, such as the Fitbit, Nike FuelBand and Jawbone UP,______ the most important part of the fitness world for the last few years.
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A.
become
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B.
becomes
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C.
have become
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D.
has become
Lời giải tham khảo:
Đáp án đúng: C
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
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