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The parachute like 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.
A. because they are attached to a cartilage rod at the elbow instead of
B. because of being attached to a cartilage rod at the elbow rather than at
C. in their attachment to a cartilage rod at the elbow instead of being attached at
D. in that they are attached to a cartilage rod at the elbow rather than at
E. in their being attached to a cartilage rod at the elbow instead of
OA为D,这里because和in that的split我已经了解了。想要咨询的是B中的being,我觉得B中的being是没问题的,being attached to a cartilage rod整个作为一个noun phrase,请NN指点。(曼哈顿上有人也问了这个being但ron只是说being有问题而没解释 )
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