15．If you promised to do something，you mustkeep your word （履行諾言）．

分析 如果你承諾了去做某事，一定要履行諾言．

解答 答案：keep your word．考查固定短語(yǔ)．情態(tài)動(dòng)詞 must后用動(dòng)詞原形短語(yǔ)keep your word，表示"履行諾言"．

點(diǎn)評(píng) 考查漢譯英．word的常用短語(yǔ)．
last word 最后一句話；最后決定權(quán)；最新成果；最新形式
in word 口頭上
in one word 總之；一句話
without a word 一句話也沒(méi)說(shuō)；一聲不吭
have a word with 與…談幾句話，和…談一談；與…商談
word for word 逐字地
word formation n．構(gòu)詞，構(gòu)詞法；詞性轉(zhuǎn)換
in another word 換句話說(shuō)；也就是說(shuō)

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