Mark the letter

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

A. What the lecturer wrote and said was too difficult for me to understand

B. I found it very difficult to understand what the lecturer said in his book

C. I would have understood what the lecturer was saying if I had read his book

D. The lecturer's book which Ĩ had not read was difficult to understand