单项选择题

If you have any questions, please go and ask_________.

A．the responsible person for the activity
B．the person responsible for the activity
C．the activity's responsible person
D．the person for the activity responsible
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单项选择题
Under no _________should we allow Jane to meet the young man again.
A．circumstances
B．conditions
C．situations
D．states
单项选择题
This mathematic problem was so difficult that no student and no teacher_________ able to solve it.
A．were
B．is
C．was
D．are
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