Question 20: A. Strained infrastructure B. Infrastructure being strained C. Straining infrastructure D. It can strain infrastructureĐoạn văn20/40Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 18 to 23.Strained infrastructureInfrastructure being strainedStraining infrastructureIt can strain infrastructureGiải thíchChọn đáp án D