Question

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Although we are concerned about the problem of energy sources, we must not fail recognizing the need for environmental protection

A. must not 

B. recognizing 

C. for 

D. concerned about

Answer 1

Đáp án là B

fail to do something (thất bại trong việc làm gì đó) là cấu trúc cố định. => sửa ‘recognizing‟ thành ‘to recognize‟.