D. to be improved
[解析]句意:政府已经采取措施来改善空气质量。take measures to do sth.“采取措施干某事”;不定式作目的状语。
[答案]A
10.(2011·北京东城第一学期期末)________ Joseph off at the airport, Sally finished her work earlier.
A. Having seen
B. Seen
C. To see
D. To be seen
[解析]句意:为了去机场给 Joseph 送行,Sally 早早地完成了工作。由句意可知,此处是动词不定式作目的状语。主语 Sally 与see 之间为主谓关系,故C项正确。
[答案]C
11.(2011·太原调研)________ the theory, the scientists asked more than sixty college students to take part in the experiment.
A. Being tested
B. To test
C. Testing
D. Tested
[解析]句意:为了检验该理论,科学家们请了60多个大学生参加了试验。由语境可知,此处为动词不定式作目的状语,故B项正确。
[答案]B
12.(2011·海口六校三联)Mr Huang told us to spend as much time as possible ________ our English studies.
A. to improve
B. improved
C. improving
D. on improving
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