单项选择题

Doctor Green went on with his experiment on human being ______ the debate going on around him.

A. for all

B. but for
C. despite of

D. due to
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Yesterday when I was walking on the street, I ______ to see an old friend of mine.
A. managed
B. happened
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I thought you ______ like something to read, so I have brought you some books.
A. may
B. might
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