From the words lettered A to D, choose the word that best completes each of the following sentences.
You didn't knock before you entered
Answer Details
The most appropriate option to complete the given sentence is "did you?" as it forms a question in the past tense, which is suitable for the context of the sentence. The sentence is asking for confirmation of whether the person knocked before entering, and "did you?" is the correct way of forming a question in the past tense.