_______ in the queue for half an hour, Tom suddenly realized that he had left h
题型：不详难度：来源：
_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A．To wait
| B．Have waited
| C．Having waited
| D．To have waited
|
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答案
| C |
解析
试题分析：考查现在分词的完成式用法：通过分析句子，后面是主句，前面是分词做状语，因为句意是：排队等了半小时后，汤姆突然意识到他把钱包落在家里了。说明是先等了半小时才发现的，状语和主句的动作有明显的先后关系。用现在分词的完成式。选C。
考点; 考查现在分词的完成式
点评：现在分词做状语有一般式doing，适用于和主句动作同时发生的情况，完成式：having done，适用于先于主句动作的情况，否定式not doing，在做题时要注意辨别 |
举一反三
Written in a hurry, ________. How can it be satisfactory?| A．they found many mistakes in the report | | B．Sam made lots of mistakes in the report | | C．there are plenty of mistakes in the report | | D．the report is full of mistakes |
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Here was a nice little present for everyone, with a suitable poem ________ to it.| A．attached | B．attacked | | C．attracted | D．attributed |
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There are a great number of natural resources in the desert, which remain to be ________.| A．explored | B．exploited | | C．exploded | D．exposed |
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“Neal, listen，” she said, looking straight at him. “I ask you not to get ________ in this kind of matter. It"s none of your business.”| A．caught | B．involved | | C．attached | D．connected |
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All of us didn"t notice Tom come into the classroom because the light happened to ________ at that time.| A．give in | B．put up | | C．go out | D．switch off |
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