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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
 從答話人的語境可知，空格處的意思“曾經(jīng)這樣想過”，即對(duì)過去情況作推測(cè)，故應(yīng)用“情態(tài)動(dòng)詞+動(dòng)詞完成式”；又因?yàn)?can 表推測(cè)不用于肯定句，故選A。
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