Freeguy
Senior Member
- Joined
- Oct 4, 2013
- Member Type
- English Teacher
- Native Language
- Persian
- Home Country
- Iran
- Current Location
- Iran
It is important that all luggage ....... for identification, before being loaded into the aircraft.
1. to be labelled
2. must be labelled
3. should be labelled
4. be labelled
Based on Michael Swan's claim, both 3 and 4 could fit here.(Subjunctive structures). But the answer key shows No.4!
Thanks!
1. to be labelled
2. must be labelled
3. should be labelled
4. be labelled
Based on Michael Swan's claim, both 3 and 4 could fit here.(Subjunctive structures). But the answer key shows No.4!
Thanks!