---Do you think he is lazy?---I____so once ,but I don't now.A mey have thought B can have thoughtCmay thinkDmight think答案为什么选A?

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---Do you think he is lazy?---I____so once ,but I don't now.A mey have thought B can have thoughtCmay thinkDmight think答案为什么选A?

---Do you think he is lazy?---I____so once ,but I don't now.A mey have thought B can have thoughtCmay thinkDmight think答案为什么选A?
---Do you think he is lazy?---I____so once ,but I don't now.
A mey have thought
B can have thought
Cmay think
Dmight think
答案为什么选A?

---Do you think he is lazy?---I____so once ,but I don't now.A mey have thought B can have thoughtCmay thinkDmight think答案为什么选A?
A may have thought (虚拟语气:对过去的虚拟)
can一般用在否定句中,can't,意为一定不是. may表猜测,表可能,也许.另,很多人以为 might是may的的过去式其实不是的,在虚拟语气中是个单独的词,也是可能,也许但肯定意为最轻.

-你认为他懒吗?
-我曾经可能那么认为过,但现在不(这么认为)了.
只是简单的过去式而已.表示过去的行为.不是虚拟语气回答中后一句否定了之前的行为.
希望能帮到你