So far, no one has given us any ______ about this and it is still a mystery to me.
| A．description |
| B．explanation |
| C．impression |
| D．statement |
28．How can they expect to learn anything________they never listen?
| A．when | B．until | C．unless | D．Though |
27．Only when_______senior high school________to show a great interest in poems.
| A．did I enter; did I begin | B．did I enter; I began |
| C．I entered; I began | D．I entered; did I begin |
26．— Why are you still here? Everybody has gone to attend the lecture by the president.
— Oh, I__________about it!
| A．wasn’t informed | B．hadn’t been informed | C．haven’t informed | D．didn’t inform |
25．Mr. Duncan raised an unnecessary question__________-he then failed to find an answer.
| A．to which | B．for which | C．with which | D．by which |
24_______the sale usually takes place outside the house ，with the audience on benches ，_______chairs or boxes。
| A．having seated | B．to seat | C．seated | D．Seating |