It is high time that we ______ the problem seriously.

Answer and explanation

Correct answer: D. considered

  1. Step 1: 'It is high time that' is followed by a past form.
Answer
considered.
Why not the others: consider, will consider and are considering don't fit.

Practise more Conditionals and subjunctive.

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It is high time that… | College English Test Band 4 (CET-4) - China