题目内容
16．Drivers are warned that it is dangerous to talk on the phone while ．（ ）| A． | drive | B． | driving | C． | driven | D． | to drive |
分析 司机被警告开车时接打电话是非常危险的．
解答 答案B 当while引导的时间状语从句与主句主语一致且谓语含有be时，可省略从句的主语和be，while driving=while they are driving．故答案为B
点评 此类题目可以归纳为"连词+分词结构"，如果主句主语与非谓语动词之间是逻辑上的主动关系，用现在分词doing，若是被动关系，则使用过去分词done，没有其他形式的变化．
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"No，darling，"she said gently．‘‘Those flowers will（12）A zucchini soon．"Every Sunday I returned to the garden to check on the （13）B，and each time I saw more zucchini．
"Are there so manv because I take good care of the plants？"I asked．
"Yes．"Nana said．"When you look after things，good things will （14）D．You should remember that．''
For months I returned every week to Nana's to see how my plants were doing，and each time I was （15）Cto see more zucchini．Until one day，they stopped （16）A，and a few weeks later，there were none．
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"That's what happens，darling．Things grow and then stop．（18）D lasts forever．''
"But I was so good to them．"
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"I'll remember that，"I said with a smile on my face．
"Nana．"I asked one day．"Should I take off all these little yellow flowers？"
"No，darling，"she said gently．‘‘Those flowers will（12）A zucchini soon．"Every Sunday I returned to the garden to check on the （13）B，and each time I saw more zucchini．
"Are there so manv because I take good care of the plants？"I asked．
"Yes．"Nana said．"When you look after things，good things will （14）D．You should remember that．''
For months I returned every week to Nana's to see how my plants were doing，and each time I was （15）Cto see more zucchini．Until one day，they stopped （16）A，and a few weeks later，there were none．
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"But I was so good to them．"
"Yes，（19）A change，but for everything that ends，something （20）B will take its place．''she said．"
"I'll remember that，"I said with a smile on my face．
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