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【题目】The volunteers are doing _____ difficult and important work; they share _____ common goal to help people in need.

A. a; a B. a; the C. 不填; the D. 不填; a

【答案】D

【解析】

试题分析: 考查冠词。the一般修饰独一无二的事物(the sun、the moon)、指已提过的人或、谈话双方都知道共同所指的事物;a用来修饰(非特指的)一(个);一(种)(a tree)。句意:志愿者们做的是艰难但是重要的工作,他们有着共同的目标——帮助需要帮助的人,故选D。

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