《第二牧羊人剧》是出自（）的连环剧。
A.考文垂
B.韦克菲尔德
C.约克
D.彻斯特
参考答案：B
—Why do you look so tired?
—Because we ________ for three hours without stopping.
A．work
B．worked
C．have worked
D．were working
构建理论过程中假设的种类有几种？（）
A.1
B.2
C.3
D.4
