单项选择题

The agreement is a basis ______ Hong Kong was returned to China.

A．by which
B．of which
C．on which
D．for which
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单项选择题
I hear that the concert last night was very splendid. I wish that I ______ that concert last night.
A．could attend
B．have attended
C．attended
D．could have attended
单项选择题
This is not ______ a bad thing, because we can learn a lot from it.
A．in itself
B．by itself
C．with itself
D．within itself
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