From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences. If you....... early...

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.
If you....... early, you will get there before nightfall.

Answer Details

The answer is "leave". The sentence is in the conditional tense and the structure of the sentence is "If + subject + simple past verb, subject + will + base form of verb". Therefore, the correct answer is "leave" which is the base form of the verb.