________you do better work than this, you won't pass the exam

Câu hỏi :

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

A. If

B. Although 

C. When

D. Unless

* Đáp án

D

* Hướng dẫn giải

Chọn D

Unless (trừ khi) = If…not

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