问几个pp里的语法题-->pumpkin转移

1.Perhaps the most significant postwar trend was the decentralization of cities thoughout the US,_____when massive highway-building programs permitted greater suburban growth.

A,and accelerated a phenomenon .     B , a phenomenon that accelerated

偶选Ａ可是答案是B,B在句中是啥成分阿？？

2.Ronald Reagan had served two terms as governor of California before____President.

A,he became B,became

before后面到底加什莫？可以加句子吗？句子的主语可以省吗？

3。Because of __________diversity,seven separate groupings or divisions of algae have been established by botanists.

A,their B,those

为啥those不行啊？应该后者更好啊，前面又没有提范围？

4。Because Mars is farther from the Sun than____,Mars takes longer to complete a revolution

A.Earth is B.is from Earth. C,what is Earth D, is it Earth

不是than后要到装吗，咋不到装选第一个拉阿c为啥也不对阿

谢谢啦…^_^

1.B中phenomenon应是前面部分的同位语.2,before bacoming/A

3.DONNOT KNOW.4than the earth is far from the sun.这是完整的,如果前后宾语相同则可省.

同位语可以放句末？1题A为何不成？

3题怎末解释哈？

4题不到装吗？

第一题中的B就是the most significant postwar trend 的同位语吧，而且就是放在句末啊！

第三题里面的diversity很明显是seven separate groupings or divisions of algae的性质吧，their就是指代后面的这部分，those是泛指吧，用在这里不合适，个人感觉。

3. 其一,用THOSE指代不清,和句子意思不符合. 如楼上指出THEIR就是SEVEN SPARATE GROUPINGS OR DIVISIONS OF ALGAE'S.

其二,虽然指代不清并造成句子绝对错误.但如果一定要用THOSE的话,后面的DIVERSITY要用复数.句子里是单数,所以用THOSE在这里一定错.