18．Weexchanged（交換） addresses and Christmas cards．

分析 我們交換了地址和圣誕節(jié)卡片．

解答 答案：exchanged．
分析句子的內(nèi)容可知，本句為一個一般過去時的句子，因為這是描述的過去的事實，根據(jù)漢語提示可知答案為exchanged．

點評 翻譯填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．

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