You will not get a refund ___ you have the receipt.

Answer and explanation

Correct answer: D. unless

  1. Step 1: "Unless" means "if not".
  2. Step 2: Without the receipt there is no refund, so "unless" is correct.
Answer
unless.
Why not the others: if, although and because do not fit here.

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You will not get a refund… | Egyptian Scholastic Test (EST)