爪形手见于（）。
A.进行性肌萎缩
B.脊髓空洞症
C.类风湿关节炎
D.桡神经损伤
E.Colles骨折
参考答案：A
34. We knew we were getting close to the park____we started seeing the tiger right next to the road.
A．when
B．before
C．while
D．Until
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