问题补充：
It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，？
A. was it
B. wasn’t it
C. did they
D. didn’t they
答案：
(答案→)A. was it
B. wasn’t it
C. did they
D. didn’t they
解析：考查反意问句，反意问句一般都是和主句一致，这句话是强调句，和it was一致，因为前面是否定，反意问句是否定式。句意是：知道18世纪人类才意识到大脑是和思维的工作有关的。选A。
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