英语题反反复反复反复Every minute should be made use of _________ our l

英语题反反复反复反复
Every minute should be made use of _________ our lessons because the final examinations are coming.
A.having gone over B.going over
C.to go over D.go over
答案选D为什么不选C
By 1990,according to a World Wildlife Fund（WWF）report,only about 4,500 tigers survived throughout the world --- half of them in India.Mr.Foresters,who followed and counted tiger footprints,estimated（估计）that in May 1992 only about 1,800 tigers existed in India.Project Tiger supported by WWF was immediately launched.Nine tiger reserves were created,with armed guards protecting them.
The project provided opportunities for researchers from India and abroad to study tigers in the reserves and gather unavailable information about their habits.Studies show that a male tiger may control a hunting territory（地盘）of between 10 and 20 sq.kms,depending on its age,size,and strength.
The territory of a male includes the smaller territories of three or four tigresses.A tiger marks the boundaries of its by spraying urine（尿）and other bodily liquids.But it tries to avoid territory fights,guided by the body smell of other tigers.Tigers fights to death only when a tigress is defending her young,or when a tiger is guarding a tigress from the attention of other males.
The popular image of the tiger is that of a cruel and undefeatable hunter.But studies show that it catches only one of 20 victims it tries to attack.
Fears have recently developed that Project Tiger has been too successful.It has enabled the tiger population to double but India’s human population has also grown out of control.The land problem is becoming serious and many rural people feel angry about the fact that some rich forests are kept for tigers.A growing number of attacks by tigers on man have added to the hostility（敌意）.
Studies have shown that_______.
A.a tigress never attacks until attacked B.the tigress is not as fierce as the tiger
C.a tiger usually fights with another tiger to defend its own territory.
D.the tiger is not as a good hunter as is commonly described
答案选B为什么不选C
15.Some people are afraid that Project Tiger_______.
A.has been carried out too far B.has failed to achieved its goal
C.hasn’t received enough attention D.is not worth the money spent on it
为什么选A

只说自己见解啊.
.
第一个..我觉得 of是介词 to也是介词 在我印象里还没有两个介词连一起的用法
.
第二个 C说老虎经常为了保护自己的领地去和其他老虎打架...但是文中有说But it tries to avoid territory fights,guided by the body smell of other tigers...所以不选C吧..
.
至于第三个..你看B说没有达到目的..错了吧..C说没有受到关注..也不对 D说不值得 也不对吧..所以选A吧.
.
以上是个人观点...有错误勿怪..