The offcials will come to Beijingto ____our preparation for olympics _____ a regular

A中test是考试的意思,排除
B中examine及物动词 vt.
1.检查;细查;诊察
The doctor examined the boy and found there was nothing the matter with him.
医生检查了男孩的身体发现他是健康的.
2.审问;盘问[(+on)]
The lawyer examined the witness.
律师讯问了证人.
3.测验[(+in/on)]
The teacher examined the students in physics.
教师考学生物理.
不及物动词 vi.
1.检查,调查
以我的经验来看 考试考的最多的就是检查身体这个意思 B排除
C中inspect是检阅;视察的意思
例如：Health Department officials came to inspect the factory.
卫生部的官员来视察这个工厂.
D中investigate是调查研究的意思 排除D
最重要的是 on a regular 是定期的意思
如果知道这个A和B都可以很快排除了
综上选C