---What do you think made Celia so happy?
--- ______ a prize in the recent competition.
| A．She won | B．Won | C．Winning | D．Because of winning |
I _____ ping-pong quite well, but I haven’t had time to play since the new year.
| A．will play | B．have played | C．played | D．play |
John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we _____ each other a couple of times before that.
| A．had been； have met | B．have been； have met |
| C．had been； had met | D．have been； had met |
— Alice came back home the day before yesterday.
— Really ? Where _____?
| A．has she been | B．had she been | C．has she gone | D．had she gone |
— I will come to attend your lecture at 10:00 tomorrow.
— I’m sorry, by then my lecture will have ended and I _____ my guests in my office.
| A．is being met | B．will meet | C．will be meeting | D．will have met |
— Has Jack finished his homework yet?
— I have no idea；he _____ it this morning.
| A．was doing | B．had been doing | C．has done | D．did |