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
—I would like to pick up your sister for you. But I don’t know her. _____?—A middle-aged woman with a round face, wearing a red blouse.
#64878
A
How about your sister
B
What do you think of your sister
C
What is your sister like
D
What does your sister do
Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？
#64479
A
isn't it
B
does it
C
doesn't it
D
is it
There is little doubt in your mind that he is innocent, ________？
#64522
A
is there
B
isn' t there
C
is he
D
isn' t he