Question

It is time the children _____

• A. went to bed
• B. go to bed
• C. goes to bed
• D. going to bed

Answer 1

Answer:

A. went to bed

• It's time + subject + v2.
• The sentence starts with it is time.
• If sentence starts with 'it's time', 'it's high time', 'it's about time' then we will always use v2nd form after subject. 
• The past tense of "go" is "went," and it is considered the second form or V2 form.
• We can use the expression it's time + subject + past verb form to refer to the present moment. These expresses that something should be done and that is already a bit late.
• Another Example:
• It's high time I bought a new pair of jeans.