5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 6
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since the appearance of karaoke machines, they________ a. had been widely used

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Since the appearance of karaoke machines, they________

had been widely used

have been widely used

were widely used

widely used

Giải thích

Chọn đáp án D