—IsMr.Greenintheoffice?—No,he

问题详情：

—Is Mr. Green in the office?

—No, he ________ be in the office. Look, the light in the office is off.

A. mustn’t                  B. can’t                    C. needn’t                  D. may not

【回答】

B

知识点：情态动词

题型：选择题