With his attention________on the shops along the roadside，he knocked an old man down while riding to school.

A  concentrating     B．concentrated     C．to concentrate      D．concentrates

答案　B

解析　考查词组，故选B项。

仔细阅读下面短文并按照语境以及括号里的具体要求完成填空，注意语法，词、词形变化等。将答案填写在答题纸上。

Soccer is an extremely popular sport through most of the world．However，as with anything that people feel over interested in，strong feelings sometimes get out of hand．English fans have been known __1____ quarreling endlessly and even fighting in the stands．Several violent actions in a game between Argentina and Chile in 1964 ____2_____ (动词词组) the death of 309 people．But up ___3___ now at least，there has been only one soccer war．

That war took place between E1 Salvador and Honduras，two Central American countries．The year was 1969，and for many years the Salvador economy had been in a frightening condition：too many people with too little land and too __4____ (little) jobs, created a situation of terrible poverty．As a result，many poor Salvadorans had been ___5____(secret) crossing into Honduras looking for work，and later they formed a strong sense ___6____ (引导词) they were mistreated there．So unfriendly feelings were already very strong at the beginning of a World Cup match between the two countries．

The first game of the three-game play off __7____ (hold) in Honduras，and the home team got __8____1-0 win in the last minute of play．Fighting broke out afterward in the streets，and the stadium was set on fire．The second game was played in E1 Salvador，and the E1 Salvador team won．More violence and fires followed． 9. By the time the third game was played in Mexico City，an actual War appeared certainly by all means（改正句中错误）. And that is exactly___10____ (引导词) happened．Immediately after E1 Salvador’s close victory，armies began marching along the border of the two countries．Then E1 Salvador attacked Honduras and bombed its airport．The war was over in less than a week，but ill feelings between the two countries lasted for years and years．

Once infected with HIV, the body is unable to _____ itself against diseases. 【吉林省长春市2011届高三第二次模拟考试（东北三省四市联合调研）】【动词短语】