In below compare the bold part of each sentence with expressions A, B, C, D and E. choose the correct expression which is an improvement upon the bold part.The train will leave at 8.30 pm, we have been ready by 7.30pm so that, we can reach the station in time.

• A. No correction required
• B. were
• C. are
• D. must be
• E. should have

Answer: (D)