. Zhong Nanshan is a famous expert who has to the origin of SARS.
A. devoted; studying
B. been devoted; studying
C. devoted; study
D. been devoted; study
网友回答
A. devoted; studying
(答案→)B. been devoted; studying
C. devoted; study
D. been devoted; study
解析：可联系答.案.网客服索取。