Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Unless you .all of my questions, I can't do anything to____________help you.
A. answered
B. are answering
C. don't answer
D. answer
Unless you .all of my questions, I can't do anything to____________help you.
A. answered
B. are answering
C. don't answer
D. answer
Câu sử dụng cấu trúc của câu điều kiện loại 1 với UNLESS (If... not)
Đáp án D.