单项选择题

I don"t think he is serious, ______

A．do I
B．is he
C．don"t I
D．isn"t he
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单项选择题
______, the new medicine is now in mass production.
A．With the solved problem
B．With this problem being solved
C．With the problem solved
D．With this problem to solve
单项选择题
Susan is not very intelligent, ______ work very hard.
A．not does she
B．either does she
C．or does she
D．neither does she
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