EXERCISE 2. HÃY CHO BIẾT TỪ ĐỒNG NGHĨA HOẶC GẦN NGHĨA, TỪ TRÁI NGHĨA C...

57. Active : The situation is serious. We must do something before it’s too late. → Passive: A. The situation is serious. Something before it’s too late must be done.B. The situation is serious. Something must be done before it’s too late.C. The situation is serious. something before must have been done it’s too late.D. The situation is serious. Something must have been done before it’s too late.