Mark the letter A, B,...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

A. Dad's car is very old, but he can't afford to buy a new one. 

B. Dad's car is very old, so he can't afford to buy a new one. 

C. Dad can't afford to buy a new one just as his car is very old. 

D. Dad's car is very old, though he can't afford to buy a new one.