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

分析 我們立刻興致勃勃地干起來．

解答 about改為out；about是介詞，后面應(yīng)該接名詞或動名詞形式，set out to do意為"開始做，著手做"．

點評 本題考查固定短語，考生在平時的學(xué)習(xí)中應(yīng)加強一些固定短語和習(xí)慣性表達的積累和應(yīng)用．

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