Which pair of words correctly completes the sentence? ___ you submit the form on time, you ___ receive the allowance.

Answer and explanation

Correct answer: D. Unless / will not

'Unless you submit' means 'if you do not submit'.
Answer: Unless / will not.
Why not the others: Unless / will: 'unless' already means 'if not', so the result should be negative. If / will not: it would mean you do not receive the allowance if you submit on time. Although / will not: it does not make a logical condition.

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