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做非谓语动词的题时,我总是由于出现一个分句而多了个and或者“,”时判断是否少谓语动词而犯错.

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做非谓语动词的题时,我总是由于出现一个分句而多了个and或者“,”时判断是否少谓语动词而犯错.
我们老师总说不要夸大逗号的作用,大家是怎么理解这句话的呢
现打出我的错题:
①The country has already sent up three unmanned spacecraft,the most recent _ at the end of last March.
A.has been launched B.having been launched C.being launched D.to be launched
此题选B,我错选A.求分析.('',''无法连接两个句子,故不能再次出现谓语动词?)
②It is worth considering what makes''convenience''foods so popular,and _ better ones of your own.
A.introduces B.to introduce D.introducing D.introduced
此题选C,我错选A.求分析.(and并列了worth后的两个动名词?)
③_ the website of the Fire Department in your city,and you will learn a lot about firefighting.
A.Having searched B.To search C.Searching D.Search
此题选D,我错选D.求分析.
④Pressed from his parents.and _ that he has wasted too much time,the boy is determined to stop playing video games.
A.realizing B.realized C.to realize D.being realized
此题选A.求分析(and并列两个状从)
高考还有184天,英语是我硬伤,
依旧等待解决ing.2013年12月8日 23:27:29
做非谓语动词的题时,我总是由于出现一个分句而多了个and或者“,”时判断是否少谓语动词而犯错.
①The country has already sent up three unmanned spacecraft, the most recent _ at the end of last March.
A.has been launched B.having been launched C.being launched D.to be launched
此题选B,我错选A.求分析.('',''无法连接两个句子,故不能再次出现谓语动词?)
权威英语语法答案解析:
分句(1) The country has already sent up three unmanned spacecraft
这个国家已经发射了3个无人驾驶的宇宙飞船
分句(2)the most recent ____ at the end of last march
分句(1)与分句(2)从间,即没有并列连词,也没有从属连词,那么分句(2)一定是做分句(1)的状语,即非谓语做状语的用法了,因此不能选择答案A 啊,故答案为B ,用现在分词的完成时形式表达.由于是被动语态,因此需要用having been done , 而不是having done
②It is worth considering what makes''convenience''foods so popular,and _ better ones of your own.
A.introduces B.to introduce D.introducing D.introduced
此题选C,我错选A.求分析. (and并列了worth后的两个动名词?)
③_ the website of the Fire Department in your city,and you will learn a lot about firefighting.
A.Having searched B.To search C.Searching D.Search
此题选D,我错选D.求分析.
④Pressed from his parents.and _ that he has wasted too much time,the boy is determined to stop playing video games.
A.realizing B.realized C.to realize D.being realized
此题选A.求分析(and并列两个状从)

高考还有184天,求各位大师详细分析下!英语是我硬伤,谢谢了!
再问: 为何解析不全?