体格检查有力的证据是

A．左股骨下端皮温升高

B．左股骨下端(干骼端)深压痛

C．左股骨下端肿胀

D．局部血管充盈怒张

E．左膝关节伸屈受限

Since the ground is wet, it ______ last night.
[A]must have rained [B]had rained[C]must rain