题目内容

14．The mats and the attached earth were lifted using the freezing technology，before        to our lab for further analysis．（　　）
A．transportingB．being transported
C．to be transportedD．transported

分析 使用冻结技术，垫子和附在上面的泥土在被运送到实验室作进一步分析之前被抬起．

解答 答案：B 考查动名词的被动式．此处before是介词，后接动词时用动名词形式，排除C、D项，且主语The mats and the attached earth与transport之间是动宾关系，要用动名词的被动式，排除A项，只有B项正确．

点评 非谓语动词作状语．它的逻辑主语就是句子的主语．因此关键看它和句子主语之间的关系．如果是和句子主语之间构成主动关系，使用现在分词，若构成被动关系，使用过去分词．若表目的，使用不定式．

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Each passenger needs a farecard to enter and go out．Up to two children under age five may travel free with a paying customer．
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Hours of service
Open：5 a．m．Mon．-Fri.7 a．m．Sat．-Sun．
Close：midnight Sun．-Thur.3 a．m．Fri．-Sat．nights
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