15. Which sentence uses the passive voice?


A. Lies destroy friendship.
B. John searched for a job.
C. The rain continued until dawn.
[D. The tree was planted by Mary.]

Right.

The sentence that uses the passive voice is option D: "The tree was planted by Mary." To identify the passive voice in a sentence, we look for a form of the verb "to be" (in this case, "was") followed by the past participle of the main verb ("planted"). In this sentence, the focus is on the tree receiving the action (being planted) rather than on who performed the action (Mary). This is why it is considered in the passive voice.