[ Grammar ]
The world is changing therefore we must adapt.
A. The world is changing; therefore we must adapt.
B. The world is changing; therefore, we must adapt.
C. The world is changing, therefore, we must adapt.
D. The world is changing, therefore we must adapt.

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What is the question?
A. What did you do?
B. What have you done?
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This clock … in 1750.
A. is made
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Grammar › ViewA:____ you ever watched the movie, Avengers: Age of Ultron?
B:Yes, I ____.
A. Did; did
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You have been watching TV _______ hours.
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