单项选择题

To know what is good and（）are two different things.

A．doing what is fight
B．to do what is fight
C．did what was fight
D．to do what was fight

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A．The host of the house.
B．Freud’ s friend.
C．A burglar.
D．The host’ s brother.

单项选择题

A．Flight 811.
B．Flight 611.
C．Flight 711.
D．Flight 911.