Mark the letter A, B, C, or D on your...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate sentence that sentence that best combines each pair of sentences in the following questions
Ben made all attempts to carry out the project. Finally, he completed it with satisfactory result

A. But for his attempts, the project could not have been completed with satisfactory result

B. If he had not attempted to carry out the project, it wouldn’t have been completed

C. His attempts made the project complete

D. He did not make any attempt because he knew that the project could never be completed