From the words lettered A to D, choose the word or group of words that best completes the sentence.
The office......he works is fully air-conditioned.
Answer Details
The best option to complete the sentence is "where."
"When" refers to a place, and in this sentence, the missing word refers to the place where the person works. Therefore, "where" is the most appropriate word to complete the sentence.
Here's the sentence with the correct answer: "The office where he works is fully air-conditioned."