Which sentence is written in the passive voice? a) alex listened to music on his earphones while he studied for his final exams. b) the assistant principal pulled out a ruler to measure the length of the girl's skirt. c) the cashier waited patiently for the business man rummaging through his pockets for change. d) the locks of the doors at school were filled with super-glue when the teachers arrived at school.

D

Explanation:did it on USA testprep and because The sentence that has an element of uncertainty is the following one: The locks of the doors at school were filled with super-glue when the teachers arrived at school. Because this sentence is written in the passive voice, it is unclear who exactly filled the school's door locks with superglue.

is there an image you meant to add?

explanation:

adverb is the answer i believe.