There, ______ Mrs． Tailor, stretching out to gather her precious eggs laid by her hen．

A．standing on a wooden box was

B．was standing on a wooden box

C．on a wooden box was standing

D．was on a wooden box standing

复式按钮在交流电动机按钮联锁正反转控制电路中的作用（）

A.启动

B.停止

C.正反转联锁

D.顺序控制