单项选择题

It was not the first time he ______ . I think it’s high time we ______ to take him seriously.

A．take us in... begin
B．had taken us in... began
C．has taken us in... began
D．took us in... begin
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单项选择题
I told him that I would ______ him to act for me while I was away from office.
A．identify
B．authorize
C．rationalize
D．justify
单项选择题
______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.
A．Deliberate
B．Consistent
C．Primitive
D．Abnormal
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