Question

but they __(3)__ keep their passports ready. (must)

• A. should
• B. must
• C. ought to
• D. has to

Answer 1

The correct option is B must

b'We use modal verbs to show if we believe something is certain, probable or possible (or not). We also use modals to do things like talking about ability, asking permission making requests and offers, and so on.

In the given sentence, option B is correct as it signifies necessity, compulsion and certainty. It fits in the context of the sentence.

Option D \'has to\' here is incorrect as it is in singular form and \'they\' in the given sentence represents plural form.

Option A \'should\' is incorrect here as \'Should\' shows suggestion, and the tone in the sentence signifies compulsion of keeping the passports ready.

Ought expresses ideas such as duty, necessity and moral obligation. It is not as forceful as must, but stronger than should. Therefore Option C is also incorrect.

The correct option is B.

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