Ever since my brother graduated from the university, he _______ in the present company for
15 years and he is now chief engineer of the company. 

A. worked  
B. has been working  
C. is working  
D. works
B
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Ever since my brother graduated from the university, he _______ in the present company for
15 years and he is now chief engineer of the company. 
[     ]
A. worked  
B. has been working  
C. is working  
D. works

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