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.

The children ______ to bed before their parents came home from work.

• A. A. were all going
• B. B. had all gone
• C. C. had all been going
• D. D. have all gone

QKHT + before + QKĐ
Dịch nghĩa: Bọn trẻ đã đi ngủ hết trước khi ba mẹ chúng đi làm về.