“Do you think he is lazy?” “I so once but I don’t now.”A. may have thoughtB. can have th

问题补充：

“Do you think he is lazy?” “I so once, but I don’t now.”

A. may have thought

B. can have thought

C. may think

D. might think

答案：

(答案→)A. may have thought

B. can have thought

C. may think

D. might think

解析：从答话人的语境可知，空格处的意思“曾经这样想过”，即对过去情况作推测，故应用“情态动词+动词完成式”；又因为 can 表推测不用于肯定句，故选A。