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18.We set about to do our task at once with great enthusiasm.

分析 我们立刻兴致勃勃地干起来.

解答 about改为out;about是介词,后面应该接名词或动名词形式,set out to do意为"开始做,着手做".

点评 本题考查固定短语,考生在平时的学习中应加强一些固定短语和习惯性表达的积累和应用.

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