请教PREP一题

wangdua0625

请教大侠，此题为何选D不选A。谢谢。

The list of animals that exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include the lower vertebrates.

(A) exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
(B) exhibits the preference to use either the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes
(C) exhibit a preference in either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
(D) exhibit a preference for using either the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
(E) exhibit the preference as to either using the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes

夜幕如斯

animals that exhibit， exhibit 是定语从句修饰的是animals 所以用复数
后面的has跟list一致 所以是单数

而且either or的对称也可以看出来 要是a 就应该是either using...or using...

wangdua0625

超谢