单项选择题

You oughtn't to have been there, ______

A．hadn't you
B．didn't you
C．oughtn't you
D．ought you
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单项选择题
I have made a(n) ______ for my mother to see the dentist at 5 o'clock tomorrow.
A．interview
B．appointment
C．opportunity
D．possibility
单项选择题
We are happy ______ we are not very rich.
A．however
B．though
C．but
D．even if
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