[amp_mcq option1=”had done” option2=”would do” option3=”have done” option4=”No improvement” correct=”option4″]
The correct answer is D. No improvement.
The sentence “It is high time that we did something about it” is in the present perfect tense. This tense is used to talk about things that have happened or been done before the present moment, but are still relevant or important. In this case, the speaker is saying that it is important to take action about something that has been going on for a long time.
The other options are all in the past tense. The past tense is used to talk about things that happened before the present moment. In this case, the speaker would be saying that it was important to take action about something that happened in the past, but is no longer relevant or important.
Therefore, the correct answer is D. No improvement.