答案:B
We didn’t expect them ___ for us when we arrived there so late.
A.to be waiting
B.to have been waiting
C.to have waited
D.to wait
肱二头肌反射的反射中枢在()
A.颈髓2~3
B.颈髓3~4
C.颈髓5~6
D.颈髓7~8
E.颈髓8、胸髓1