Electron storage rings ___ in investigations of the structure of ...

[ Grammar ]

Electron storage rings ___ in investigations of the structure of materials.

A. They are used

B. That are used

C. Used

D. Are used

Select your answer:

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fly + ing =

A. flying

B. fliing

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There was a lot of action in the film. I think the actions were cool. The film was ________________.

A. interesting

B. boring

C. exciting

D. disappointing