摘要： Take a taxi , you'll miss your train . A. and B. if C. otherwise D. or 答案是C项.祈使句可用来取代if从句来表示评论.提出要求.发出忠告或威胁等.用祈使句比用if从句表达更强的紧迫性.在表示评论和要求时.其连词用and.表示忠告时用连词otherwise.表示威胁时.用连词or.例如:Fail to pay and they will cut off the electricity . (不交钱.他们就会中断供电.)这是客观的评论,Tell us what to do and we will get on with it . (如果你告诉我们该做些什么.我们就会把它做好.)这明显是请求,Put on you overcoat when you go out , otherwise you will catch cold . (外出时你应该穿上大衣.不然的话你会感冒的.)显然这是忠告,Drop that gun , or I will shoot you . (把枪放下.否则我就开枪打死你.)很明显.这是威胁.

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