“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”，即對過去情況作推測，故應用“情態(tài)動詞+動詞完成式”；又因為 can 表推測不用于肯定句，故選A。
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