It is necessary that this machine-tool _______ every day.
（A）be oiled
（B）oil
（C）is to be oiled
（D）oiled
参考答案
继续答题：下一题
更多大学英语单项选择题库试题
- 1I am unable to attend the meeting because of a ________ engagement.
- 2He will stop showing off, if no notice ____ of him.–被动语态
- 3Which of the following is true about the book Solent Spring ?
- 4How does the author evaluate the generalizations of people’s types in Para. 3?
- 5The chairman was blamed for letting his secretary ________too much work last week.
