关于几道语法的疑问

lizzylovely

GWD6-Q27:
The results of two recent unrelated studies support the idea that dolphins may share certain cognitive abilities with humans and great apes; the studies indicate dolphins as capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and to grasp spontaneously the mood or intention of humans.

A.    dolphins as capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and to grasp spontaneously
B.    dolphins’ ability to recognize themselves in mirrors—an ability that is often considered as a sign of self-awareness—and of spontaneously grasping
C.    dolphins to be capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and to grasp spontaneously
D.    that dolphins have the ability of recognizing themselves in mirrors—an ability that is often considered as a sign of self-awareness—and spontaneously grasping
E.    that dolphins are capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and of spontaneously grasping
答案选E，D又怎么不对呢

lizzylovely

还有这个
GWD6-Q17:
Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

A.    Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve
B.    Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve
C.    Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving
D.    There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving
E.    There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving
这题正确答案是A，但between 1876 and 1904 不是表示一段时间吗，为什么不能用现在完成时。而且of 后面是修饰construction, 难道不应该紧跟其后吗？

花子落落

GWD6-Q27
去掉破折号你看后面这个and spontaneously grasping木有谓语动词吖~

花子落落

第二题就算是用完成时也使用该用过去完成时。

yougushizi

这题突破口是不是介词啊？
ability to capable of