问几道题 求大家帮忙解答 不胜感激

王小兔兔

请大家帮忙解答这样几道语法题
1.    The number of undergraduate degrees in engineering awarded by colleges and universities in the United States increased by more than twice from 1987 to 1985.
A.    increased by more than twice
B.    increased more than two times
C.    more than doubled
D.    was more than doubled
E.    had more than doubled
正确答案是C，这是为什么呢，我只知道B是肯定不对的
2.    The British Admiralty and the War Office met in March 1892 to consider a possible Russian attempt to seize Constantinople and how they would have to act militarily to deal with them.
A.    how they would have to act militarily to deal with them
B.    how to deal with them if military action would be necessary
C.    what would be necessary militarily for dealing with such an event
D.    what military action would be necessary in order to deal with such an event
E.    the necessity of what kind of military action in order to take for dealing with it
正确答案是D,可是，名词attempt怎么能和what引导的从句并列呢
3.    The Baldrick Manufacturing Company has for several years followed a policy aimed at decreasing operating costs and improving the efficiency of its distribution system.
A.    aimed at decreasing operating costs and improving
B.    aimed at the decreasing of operating costs and to improve
C.    aiming at the decreasing of operating costs and improving
D.    the aim of which is the decreasing of operating costs and improving
E.    with the aim to decrease operating costs and to improve
   正确答案是A，我的疑问是，先暂且不管后面的平行结构，为什么是aimed而不是aiming呢？并且，我认为E是没有问题的啊
4.    Despite protests from waste-disposal companies, state health officials have ordered the level of bacteria in seawater at popular beaches to be measured and that the results be published.
正确选项是这样的：that the levels of bacteria in seawater at popular beaches measured and the results 后面是不是少了一个be啊