GWD26 Q5

5

The
particular design of muscles and bones in the neck and limbs of the turtle
allow

that it
can draw in its exposed parts such that an attacker can find nothing

but hard
shell to bite.

A.     allow that it can draw in its exposed parts
such that

B.     allow it to draw in its exposed parts, and
so

C.     allows for it to draw in its exposed parts
and that

D.     allows that it can draw in its exposed
parts, and so

E.      allows it to draw in its exposed parts, so
that 

请问为什么选D不选E啊??? 不是更简洁吗,而且 and so看上去好奇怪啊...

情态动词can

allows it can和allows it to do sth是不同的概念

而且 so that 用在这里不合适

我也觉得and so 不对 是副词 不可以连接句子