Question

Fill in the blank with the most appropriate word:
You ________ have a driving license if you want to drive a car.

• A. ought
  
• B. have to
• C. have
• D. had to

Answer 1

The correct option is B have to

Answer : B

Modal verbs are auxiliary verbs that are used to express necessity or possibility.

Let's take a look at the usage of the modal verbs in the options:

• ought : 'ought' is a synonym for 'should'; It is more formal than 'should' and is less commonly used
• have to : It is used to express an external obligation in positive sentences and removing an external obligation (or necessity) in the negative sentences
• had to : It is used to express a necessity felt by the speaker in the past
• have : It is an ordinary verb, that means to ''possess'' / "own"

Here in the question, we see that the speaker is an external obligation, that is the obligation to have a driving license in order to drive a car.

• As it is an obligation and not a suggestion, "ought" is not appropriate here.
• The sentence is not in the past tense & also again as it is not a personal necessity felt by the speaker but an external obligation / a rule to have license in order to drive, "ought" is also not appropriate.
• have is an ordinary verb & not a modal verb, so it is not appropriate.

Therefore from among the options, 'have to' is the most suitable verb to complete the sentence.

Thus, the correct complete sentence is:

You HAVE TO have a driving license if you want to drive a car.