Mark the letter A, B, C or D to...

Câu hỏi: Mark the letter A, B, C or D to indicate the sentence that best combines each pair of sentences in the following questions
You don’t try to work hard. You will fail in the exam.

A. Unless you don’t try to work hard, you will fail in the exam

B. Unless you try to work hard, you won’t fail in the exam.

C. Unless you try to work hard, you will fail in the exam.

D. Unless do you try to work hard, you will fail in the exam.