Nothing he did was helpful to solve this problem, _______?
#64891
A
didn’t he
B
was it
C
wasn’t it
D
did he
推荐题目
-- Peter, set down the result of the experiment, ______?-- Oh, yes, but I need to find my pen first.
#64650
A
will you
B
shall you
C
don't you
D
do you
