【单选题】— How did you like the lecture tonight? — Very__________.I doubt if I will come to this kind of lecture next time. [ ]
【单选题】---How did it _________ that all the flowers died ? ---I had forgotten to water them.
【单选题】—You didn’t come to school yesterday, did you? —_______, though I was very busy.
【单选题】I was really busy these days, otherwise I _______ to your birthday party last night.
【单选题】— Did you usually come to school by bike? — _____. But I sometimes walked. [ ]
【单选题】虚拟语气 I did not see your sister at the meeting. If she ____, she would have met my brother A. has come B. did come C. come D. had come
【单选题】真实气体在什么状态下其行为会接近理想气体:
【单选题】.与闭环系统相比较,开环系统主要是没有________。