问题

“Do you think he is lazy?” “I _________ so once, but I don’t now.”

A:may have thought
B:can have thought
C:may think
D:might think

正确答案是：

同类题型

I must have seen him somewhere before, but his name ________me for the moment.[ ]

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Ittook _____building supplies to construct these energy-saving housesIt took brains, too.[ ]

. The purpose of the research had a more important meaning for them than ____.