—Under no circumstances the door to the Data Centre unlocked.—I promise I'll be more care

问题补充：

—Under no circumstances the door to the Data Centre unlocked.

—I promise Ill be more careful in future.

A. you need to leave

B. should you leave

C. need you leave

D. you should leave

答案：

A. you need to leave

(答案→)B. should you leave

C. need you leave

D. you should leave

解析：答案：B考查倒装句。句意为：——你无论如何都不能不锁数据中心的门就走了。——我答应你下次我会注意的。under no circumstance相当于in no case/in no way/on no account/by no means/never，意为“决不”，置于句首时，句子要部分倒装，即：将助动词或情态动词放在主语之前。若句中没有助动词或情态动词，则需添加助动词do，does或did，并将其置于主语前。由语境可知，此处有责怪的意思，情态动词应用should。故B项正确。