下列句式不同于其它三项的一项是( )

CCTV-10 often plays _____ around the world . It canhelp us learn more about not only nature but also different cultures andcustoms.

Why are we always having examinations?— _____ whether we have grasped the knowledge in every subject.[ ]

Train services are usually ________ and run regularly every day. [ ]

The old man is badly ill and he needs___________ to hospital at once.