----.Let’s go to find our manager in his office.--It’s so late at night .He be there .

----.Let’s go to find our manager in his office.
----It’s so late at night .He be there . Let’s make it another day .
A. can’t
B. needn’t
C. mustn’t
D. ought not to have been

(答案→)A. can’tB. needn’tC. mustn’tD. ought not to have been解析：考查情态动词。can’t不可能。句意：晚上太迟了，他不可能在那儿。故选A。

感谢回答，我学习了