Take a taxi , _____ you'll miss your train .

      A. and          B. if       C. otherwise       D. or

C


解析:

祈使句可用來取代if從句來表示評論、提出要求、發(fā)出忠告或威脅等。用祈使句比用if從句表達(dá)更強(qiáng)的緊迫性。在表示評論和要求時(shí)，其連詞用and，表示忠告時(shí)用連詞otherwise，表示威脅時(shí)，用連詞of。例如：Fail to pay and they will cut off the electricity . (不交錢，他們就會中斷供電。)這是客觀的評論；Tell us what to do and we will get on with it . (如果你告訴我們該做些什么，我們就會把它做好。)這明顯是請求；Put on you overcoat when you go out , otherwise you will catch cold . (外出時(shí)你應(yīng)該穿上大衣，不然的話你會感冒的。)顯然這是忠告；Drop that gun , or I will shoot you . (把槍放下，否則我就開槍打死你。)很明顯，這是威脅。

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