The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
| A．what | B．who | C．that | D．which |
—I hear Jane has gone to the Holy Island for her holiday.
—Oh, how nice! Do you know when she ____ ?
| A．was leaving | B．had left | C．has left | D．left |
All the preparations for the task ___________, and we’re ready to start.
| A．completed | B．complete | C．had been completed | D．have been completed |
Selecting a mobile phone for personal use is no easy task because technology __________ so rapidly.
| A．is changing | B．has changed | C．will have changed | D．will change |
I wonder why Jenny ____ us recently. We should have heard from her by now.
| A．hasn’t written | B．doesn’t write | C．won’t write | D．hadn’t written |
My uncle ______ until he was forty –five.
| A．married | B．didn’t marry | C．was not marrying | D．would marry |