201712A Structure B Directions: Fill in the blank with the proper form of the word given in bracket. When they entered the area, the visitors (require) ____________ to turn off their smartphones.
举一反三
- When they entered the area, the visitors (require) _________ to turn off their smartphones.
- When<br/>they entered the area, the visitors ______ to turn off their<br/>smartphones. (require)
- When they entered the area, the visitors ( require) to turn off their smartphones. The answer isisrequired.
- When they entered the area, the visitors ____ to turn off their smartphones. A: are requiring B: were being required C: were required D: requires
- Fill in the blank with the appropriate form of the word given in the bracket. The illness was (diagnose)______ as mumps.