A series of attempts ___, we came to a wonderful solution to the problem.
（A）had been made
（B）were made
（C）having made
（D）having been made
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更多大学英语单项选择题库试题
- 1—It is said that another new car factory ____ now.现在进行时的标志词 — Yeah.It _______ one and a half years.-正在建，说明将要花费一年半的时间
- 2If you have a regular pattern of your day, it will help you plan your time.
- 3He hardly _______ say anything more, since you know all about it.
- 4A series of attempts ___, we came to a wonderful solution to the problem.
- 5The company has confidence in its latest model of computer __ low cost will make it attractive to students.
