定语从句练习题1. The English play _ my students acted at the New Years party was a great success.A. for which B. at which C. in which D. on which2. _ is often the case, we have worked out the production plan.A. Which B. When C. What D. As3. Everything he _ away from him before he returned to his hometown. A. took B. had been takenC. had had been taken D. had taken4. Was _ Bill _ played basketball very well _ helped the blind man across the street?A.