Time Expressions for Changes and Innovations

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There are different time expressions that can be used with Present Perfect to emphasize a meaning. Look carefully at the position, meaning and sentence structure.

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Tapia Linares Angel Gabriel

México

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Time Expressions for Changes and Innovations

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Froggy Jumps Time Expressions for Changes and InnovationsVersión en línea There are different time expressions that can be used with Present Perfect to emphasize a meaning. Look carefully at the position, meaning and sentence structure. por Tapia Linares Angel Gabriel 1 Petrochemical engineers have _____ developed plastics and fine chemicals. a b c 2 The nuclear industry hasn't developed non-toxic energy_______. a b c 3 Lithium-ion batteries have revolutionized the industry ____ thirty years. a b c 4 Nanotechnology has been improving the different scientific sectors ______ its creation. a b c 5 I haven't bought an electric car _____, but my friends say it's very cheap. a b c 6 We have been implementing clean energies around the world _____ 1970. a b c 7 I have _______ installed the new solar water heater in my house. a b c 8 Elon Musk has been planning to take people to Mars ____ many years. a b c 9 Google has ____ released its new app. a b c 10 Apple has launched a new product _______. a b c

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