【題目】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】

試題分析: 考查冠詞。the一般修飾獨(dú)一無二的事物(the sun、the moon)、指已提過的人或、談話雙方都知道共同所指的事物；a用來修飾(非特指的)一(個(gè))；一(種)（a tree）。句意：志愿者們做的是艱難但是重要的工作，他們有著共同的目標(biāo)——幫助需要幫助的人，故選D。

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