______ it have been the failure to pick up directions from the ground control that caused the air crash?
| A．Must | B．Could | C．Would | D．Should |
Mike spent time with ____native people to gain ____ better understanding of the country.
| A．the; a | B．the; / | C．a; the | D．/; a |
(2014届山东省潍坊市高三3月模拟考试英语试卷）
It is reported that recently discovered painting may be Van Goph．
| A．the；不填 | B．a；the | C．a；不填 | D．the；a |
There is no easy walk to __________ freedom anywhere，and many of us will have to pass through __________ valley of the shadow of death again and again before we reach the mountaintop of our desires．
| A．/；the | B．the；the | C．/：／ | D．the；／ |
Organized volunteering and work experience has long been ___vital companion to___ university degree courses.
| A．不填；the | B．a; the | C．a; 不填 | D．a ; a |
Under______ reform program announced on Nov 15, the government has decided to give____ green light to couples wanting to have two children if one of the two parents is an only child.
| A．a ; a | B．the ; the | C． / ; a | D．a ; / |