Some of the exercises appear
to be ________ ones that you have done, but after taking ________ second look, you will find that they are different．
| A．不填; the | B．the; the | C．the; a | D．the; 不填 |
He suggested the problem worth paying attention ______ at the meeting.
| A．to be discussed | B．to being discussed | C．to discuss | D．to discussing |
I fixed my eyes upon the newcomer, wondering whether I ________ him somewhere before．
| A．saw | B．has seen | C．had seen | D．would see |
一I’m sorry! I would have taken him to hospital if I had known he was seriously ill.
一But ______ .
| A．you didn’t | B．you hadn’t | C．he wasn’t | D．you aren’t |
The question that puzzled them is ____ they can get rid of the air pollution in the area.
| A．how is it that | B．that how | C．that it is how | D．how it is that |
It is reported that many a new house ____ at present in the disaster area in Gansu Province.
| A．was being built | B．were being built | C．is being built | D．are being built |