题目

 Many people watched the boys ______ the mountain at that time.    A．climb               B．climbing       C．to climb      D．climbed 答案：B19．在△ABC中，角A、B、C的对边分别为a、b、c，已知a=1，A=30°，$sinBcotA+cosB=\sqrt{3}$，求b边的长．