高三英语语法复习动词（二）1. The structure of aircraft _ all the time. a. is being changedb. had been changedc. is changedd. has changed2. The poor slave _ from morning till night. a. made to workb. was made workingc. was made workd. was made to work3. A friend of mine returned to his house after his holiday, only to find that it _. a. to be broken intob. had broken into c. was broken intod. had been broken into4. The children _ many times not to play with fire.
