英语专业四级词汇语法练习题(一)1. All of the plants now farmed on a large scale were developed from plants _wild.A. that once grow B. once they grow C. they once grew D. once grew2. By the time you graduate， we_in Australia for one year.A. will be staying B. will have stayed C. would have stayed D. have stayed3. He appreciated_the chance to deliver his thesis in the annual symposium on Comparative Literature.A. having given B. to have been given C. to have given D. having been given4.
