Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Trả lời câu hỏi dưới đây:
______ your precious help, I wouldn’t have certainly overcome most of the practical difficulties
A. nếu không + clause
B. miễn là
C. nếu không + clause
D. nếu không + N/ N-phrase