Tom Williams, scientist of the British Association for the Advancement of Science, is one of kind of persons who can give you hand whenever you are in trouble.
A. a / a / a
B. a / the / a
C. the / a / a
D. the / the / the
网友回答
A. a / a / a
(答案→)B. a / the / a
C. the / a / a
D. the / the / the
解析：可联系答.案.网客服索取。