1. Have you taught him how to operate that new machine -> Has _ 2. Since the 1980s, people have recycled more and more paper -> Since 1980s, _
2 câu trả lời
1. Has he been taught how to operate that new machine?
2. Since 1980s, more and more paper has been recycled.
=>
1. Has he been taught how to operate that new machine?
2. Since 1980s, more and more paper has been recycled.
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