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“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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