Question

Fill suitable Modal Auxiliary:
It's time the government _________ do something about the problem.

• A. should
  
• B. must
• C. will
• D. can

Answer 1

The correct option is A should

Option A: 'Should' expresses obligation or duty. It relates to the given sentence, which states that 'it's the government's duty to do something about the problem'.

Option B: 'Must' also refers to obligation, but it is a much stronger word compared to 'should'. 'Must' is used when people are compelled to do something, or an action that is most likely going to happen.

In contrast, 'should' describes a suggestion or refers to a desirable goal.

In the context of this sentence, 'should' is more appropriate than 'must' as it refers to an opinion and is relevant to the sentence.The sentence is complete in meaning, and hence option A is correct and B is wrong.

Option C: 'Will' refers to the future.

Option D: 'Can' refers to a possibility.

The words 'it's time' brings forth a opinion, rather than a future action (will) or possibility (can).

Hence options C and D are wrong.