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Question 1:
The Acep XT300 scanner shuts down automatically when _____ for a long time, which lowers electricity costs.
A. inactive
Feedback The structure of the reduced form when two clauses have the same subject. The original sentence is "The Acep XT300 scanner shuts down automatically when it is inactive for a long time, which lowers electricity costs."
B. was inactive
C. is inactive
D. has been inactive

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