Multiple choice

I wouldn't have known the answer if I

  1. hadn't checked before.

  2. didn't check before.

  3. wouldn't check before.

  4. won't check before.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a third conditional sentence. The result clause is 'wouldn't have known', so the 'if' clause must be in the past perfect.

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