The streets are crowded with a population when have no interest in learning1/50Mark 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. The streets are (A) crowded with (B) a population when (C) have no interest (D) in learning.arewithwhenno interestGiải thíchĐáp án C. when → who Đại từ who thay thế cho danh từ chỉ người đứng làm chủ ngữ.