Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution’.
It is time we should have done something useful.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. did
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"It is time" is followed by the simple past tense "we did" to correctly express that the time for action has come.
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The phrase "we should have done" is not appropriate here as it implies a past obligation or regret, whereas "we did" is the proper form for expressing the need for action in the present.
Thus, "did" is the appropriate substitution.