[ Grammar ]
Electron storage rings ___ in investigations of the structure of materials.
A. They are used
B. That are used
C. Used
D. Are used
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Continuous Tenses › ViewWhich sentence best illustrates the use of the future continuous tense?
A. They were having dinner.
B. They are having dinner.
C. They will be having dinner.
D. They had dinner.
Gerund & Infinitives › View
It is important ____ people back right away
A. calling
B. to call