轿厢安全门或轿厢安全窗如果锁紧失效，该装置应使电梯停止。只有在重新锁紧后，电梯才有可能恢复运行。（）
参考答案：对
单选。
the hens.[ ]
A. Feet
B. Foot
C. Feed
— I come all the way to say "Thank you" and we ________ it without you.
— Think nothing of it. [ ]
A. should have done
B. mustn't have done
C. couldn't have done
D. needn't have done
