23．—It’s reported that the new underground line has been completed．
—Yes but it hasn’t been made clear________it’s to be opened to traffic．
| A．that | B．who | C．what | D．When |
_____ was expected, he failed in the exam.
| A．That | B．As | C．Which | D．It |
I was about to go to bed _____ one of my old classmates made a call to me.
| A．when | B．as | C．while | D．that |
Mr King, _____ legs were badly hurt, was quickly taken to hospital.
| A．who | B．that | C．whom | D．whose |
He was generally _________ to be the finest poet in the land.
| A．received | B．regarded | C．seen | D．acknowledged |
It is the first time that I _____ abroad.
A. have been B. was B. will have been D. am