they won't pass the exam if they don't revise (unless) => viết lại câu sử dụng unless

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->Unless they revise, they won't pass the exam 

#good_luck 

They won't pass the exam if they don't revise (unless)

=> Unless they revise, they won't pass the exam

Chúc bạn học tốt.Mãi  yêu ^^

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