扫描二维码，直接登录
题库 / Prep2007E2-SC-103
The parachutelike membranes of Africa's scaly-tailed flying squirrels differ from those of the flying squirrels in the family Sciuridae because they are attached to a cartilage rod at the elbow instead of the wrist.
because they are attached to a cartilage rod at the elbow instead of
because of being attached to a cartilage rod at the elbow rather than at
in their attachment to a cartilage rod at the elbow instead of being attached at
in that they are attached to a cartilage rod at the elbow rather than at
in their being attached to a cartilage rod at the elbow instead of
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
at是一定是加的，否则会有歧义：wrist可以理解成是在替代cartilage 也可以理解成是在替代 elbow，加了at则只能替代elbow；排除AE
C instead of 前后不平行 排除
B because of 加名词 being attached 错误
登录 或 注册 后可以参加讨论