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。