New technology____________to stop the students from cheating in the exam last year.
A. is used             B.  used              C.  was used
C
be used to sth習慣于某事;used to do sth過去常常做某事. sth be used to do sth某物被用來做某事。句意：去年在考試用新技術(shù)被用來防止學生們在考試中作弊。結(jié)合語境可知選Ｃ。
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