题目内容

During _________ 3-day conference, global warming became _________ major concern of all the representatives.
A.the; aB.a; theC.the; \D.a; \
A
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。
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