Tom was suffering from fever. He could not attend the class.

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.
Tom was suffering from fever. He could not attend the class.
A. Tom was suffering from fever because he could not attend the class.
B. Tom was suffering from fever although could not attend the class.
C. As Tom was suffering from fever, he could not attend the class.
D. Tom was suffering from fever but he could not attend the class.