gwd26-5

5. GWD26-Q5

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

b和e两个里为什么选b不选e? and so和so that 有什么区别？

另外还有一个关于语法点的问题 sb prove to ...是不是只能用主动不能用被动？