A． You are not a fish, so you don't know how it feel
B． You are a fish, and maybe you know how it feel
C． You know how a fish feels, don't you?
D． You were not a fish, were you?
A． it is a rule
B． it as a rule
C． it a rule
D． that a rule
A． so angry that
B． such angry as to
C． such angry that
D． so angry as to
A． having cried
B． to be crying
C． crying
D． to have been crying