题目内容

“Do you think he is lazy?” “I _________ so once, but I don’t now.”
A．may have thoughtB．can have thoughtC．may thinkD．might think
A
 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。
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