单选题
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
【正确答案】
A
【答案解析】
介词短语辨析
各个选项中，for all表示尽管、虽然，与in spite of和despite基本相同；but for表示若不是…；despite 后面不需要加介词of；due to因为、由于，根据题意，故选A。
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