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SAT 语法题!1.The shift from traditional to cosmetic dentistryA.

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SAT 语法题!
1.The shift from traditional to cosmetic dentistry
A. is because adults are getting fewer cavities and becoming more vain
D. is occuring because adults are getting fewer cavities and becoming more vain
答案D 这题始终不明白
2.(a squadron of newly trained, enthusiastic firefighters from training academies,each year they graduate )to begin work in the nation's cities.
答案 Each year a squadron of newly trained, enthusiastic firefighters graduates from training academies.
(为什么原句中A SQUADRON OF. 不能修饰后句的THEY?另外就算修饰,THEY要改成HE OR SHE吗?)
3. (If there had been) a power failure, the hospital will run on electricity from its own generators, which can operate for 200 hours.
答案D Should there be
(是不是后面是对将来的情况,前句也要是对未来的虚拟?这种情况是否也使用于过去或者现在?)
(By painting them) this afternoon, the walls would be completely dry by tomorrow evening.
答案(C) Were they to be painted
就像这题么
4.(There is speculation that the name "Wendy" was) the invention of J.M Barrie,who created a character by that name for his famous play Peter Pan.
E) The name "Wendy" is by some speculation the invention of Barrie
答案是原句,为什么
1,something is because,你有看过这种用法吗,because 做什么成分
2 a squadron of 修饰 academicies,原句run-on,he or she用在单数上,for example,everyone needs to take SAT.这时候如果后面再指到,everone可以用 he or she,
3.虚拟语气用法自己百度吧,详细,而且主句 will就告诉你什么时态了
如果BY painting的话,就是由 wall发出动作,这个动作只有人发出的,所以 BY painting是错误的.
4.语感而且,sat中 宾语从句一般that不省略
自己买本sat语法书做做,有解析的那种.
本人12月份考,求祝福