Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

Large cities around the world are adopting strategies to combat this issue,  ______ it is not uncommon to find plants growing on top of roofs or down the walls of large buildings.

• A. A. however
• B. B. for
• C. C. otherwise
• D. D. and

Hai mệnh đề có ý bổ sung cho nhau nên cần điền liên từ “and”.