90. The
parachutelike membranes of
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
A: instead of 应该补充完整at the wrist，否则会有歧义
B: because of + doing 不如从句表达清晰
C: 表原因用从句比介词强；instead of 前后不对称
D: correct
E: their being 错
请问这里的答案D中的they不存在指代不清吗？
我个人的看法，（1）也许会有，但从从句意上来说不会有，
（2）这题每个选项都有they，所以不必考虑
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