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.
Students will not be allowed into the exam room if they __________ their student cards.
A. don't produce
B. didn't produce
C. produced
D. hadn't produced
Students will not be allowed into the exam room if they __________ their student cards.
A. don't produce
B. didn't produce
C. produced
D. hadn't produced
Cấu trúc câu điều kiện loại 1: If + S + V (present tense)...., S + will + V bare-inf... (điều kiện có thể xảy ra ở hiện tại hoặc tương lai)
Đáp án A.