专四考试第四部分是语法词汇题共有三十道题，同学们平时复习专四语法知识的同时可以做做专四全真模拟练习题。
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 grew
2. 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 stayed
3. He appreciated____the chance to deliver his thesis in the annual symposium on Comparative Literature.
A. having given B. to have been givenC. to have given D. having been given
4. The government official can hardly find sufficient grounds ____his arguments in favor of the revision of the tax law.
A. on which to base B. which to be based on C. to base on which D. on which to be based
5. Living in the desert involves a lot of problems, ____ water shortage is the worst.
A. not to mention B. of which C. let alone D. for what
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