In the past several weeks, many cities in Northern China from heavy fogs and severe cold.
| A．had suffered | B．have been suffering | C．were suffered | D．suffered |
twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
| A．Examining | B．Examined | C．Being examined | D．Having been examined |
---Are you a teacher? ---No, but I _______.
| A．used to | B．used to being | C．used to be | D．was used to |
Before he went abroad，he spent as much time as he _____ English.
| A．could learning | B．learned | C．to learn | D．could learn |
As time went by, the plan he stuck ____ fairly practical.
| A．to proved | B．to proving | C．proved | D．to be proved |
The detective,____ to be reading a newspaper, glanced at the man_____ next to a woman.
| A．pretending, seated | B．pretended, seated | C．pretending, seat | D．pretended, seating |