It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind， ？
#64932
A
was it
B
wasn’t it
C
did they
D
didn’t they
推荐题目
You had one of your teeth pulled out yesterday, ______?
#64939
A
had you
B
hadn’t you
C
did you
D
didn’t you
—John isn’t a football coach, is he?—__________.
#64884
A
No, but he was
B
Yes, he isn’t
C
Yes, he wasn’t
D
No, he is
The student must be working very hard, ________?
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A
doesn’t he
B
mustn’t he
C
needn’t he
D
isn’t he