Take a taxi , _____ you'll miss your train .
A．a(chǎn)ndB．ifC．otherwise D．or
C
祈使句可用來(lái)取代if從句來(lái)表示評(píng)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(píng)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(huì)中斷供電。)這是客觀的評(píng)論；Tell us what to do and we will get on with it . (如果你告訴我們?cè)撟鲂┦裁�，我們就�?huì)把它做好。)這明顯是請(qǐng)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(huì)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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