问题补充：
----Was he present a the meeting?
---- He not have attended it, for he was busy repairing his computer all the time.
A. can
B. might
C. must
D. should
答案：
(答案→)A. can
B. might
C. must
D. should
解析：根据he was busy repairing his computer all the time可知“他不可能出席会议”故用can’t表示否定猜测。
【标签】情态动词表猜测
