Topics: Word Form & Verb Tense
Thanks to various sensors _____ in every home and public place, Barbara’s center can predict probable disaster
A. installed
B. installing
C. installment
D. to install
Select your answer:
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Grammar › ViewA “Who” question…
A. asks about a person
B. asks about a thing
C. asks about a time
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Mobile phones were invented _______ the 20th century
A. at
B. in
C. on