Câu hỏi: Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
___________, we had already put out the fire.
A. Until the firemen arrived to help
B. No sooner the firemen arrived to help
C. By the time the firemen arrived to help
D. After the firemen arrived to help
___________, we had already put out the fire.
A. Until the firemen arrived to help
B. No sooner the firemen arrived to help
C. By the time the firemen arrived to help
D. After the firemen arrived to help
Kiến thức mệnh đề time
By the time S + V (qk) + St, S + had + Vp2
By the time S + V (qk) + St, S + had + Vp2
Đáp án C.