— Where is Mr. Wang?— He is not here. He must the students’ papers in the office.A. corre

问题补充：

— Where is Mr. Wang?

— He is not here. He must the students’ papers in the office.

A. correct

B. have corrected

C. be correcting

D. corrects

答案：

A. correct

B. have corrected

(答案→)C. be correcting

D. corrects

解析：考查时态。句意：—王先生在哪里？—他不在这里。他一定是在办公室里批改学生的试卷。根据句意是指现在正在发生的事情，故使用must be doing对现在的情况进行推测。故C正确。