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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
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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；
B，because of being attached，介词接名词，名词本身就是物体，不带主语，跟在介词后面没有表示先行词在being attached，应改成their being attached
C，in their attachment 和 being attached 不能平行，一个是动名词，一个是simple gerund
D，that前可以加介词，如：It is true in that all seated voted yes.；I am sorry for that.
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