What we have to admit is that never in the past thirty years __________ so greatly as today.
| A．has China changed | B．China has changed |
| C．did China change | D．China had changed |
The telephone _______ three times in the last hour, and each time it ________ for my father.
| A．had rang； was | B．has rung； was |
| C．rang； has been | D．has been ringing； is |
“Aha, you’re a chain smoker！” “Only at home. Nobody _______ that but you.”
| A．discovered | B．had discovered |
| C．discovers | D．is discovering |
“What’s your opinion on the matter, please？” “Oh, sorry, I _______.”
| A．wasn’t to listen | B．haven’t listened |
| C．wasn’t listening | D．hadn’t listene |
“I took part in the TOEFL. It was really hard.” “Did you ______ a lot？”
| A．Have you studied | B．Did you study |
| C．Had you studied | D．Do you study |
You ______ television. Why not do something more active？
| A．always watch | B．are always watching |
| C．have always watched | D．have always been watching |