The research scientists often meet with problems_____new types of instrument for their solution.
A: requiring
B: required
C: to require
D: being required
A: requiring
B: required
C: to require
D: being required
举一反三
- When they entered the area, the visitors ____ to turn off their smartphones. A: are requiring B: were being required C: were required D: requires
- The electric furnace is used extensively to produce the high-grade steel _____ for the manufacture of steel alloys. A: to be required B: requiring C: required D: that required
- In an in-flight emergency requiring immediate action, the pilot in command may ________ any rule of this part to the extent required to meet that emergency.
- Formal research methods are generally required for what type(s) of business document(s)? A: Routine e-mail messages B: Routine memos C: Long reports and complex business problems D: All of these choices would require formal research.
- He has got the __________ knowledge for the job. A: require B: required C: requirements