During 3-day conference, global warming became major concern of all the representatives.
A. the; a
B. a; the
C. the; \
D. a; \
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(答案→)A. the; a
B. a; the
C. the; \
D. a; \
解析：本题考查冠词。the 3-day conference特指的3天的会议，故用the, a major concern一项关注的焦点，泛指，故选A。