单项选择题

I regret to have not paid more attention to our English lessons at school（）.

A．not paying
B．not having paid
C．have not paid
D．not to have paid

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单项选择题

Depression that inflicts people who believe their lives lack content when the rush of the busy week stops referred to by a prominent psychiatrist as Sunday Neurosis（）.

A．has been referred to by a prominent psychiatrist
B．has been referred to as by a prominent psychiatrist
C．a prominent psychiatrist has referred to it
D．it has been referred to by a prominent psychiatrist

单项选择题

When an organism is completely encapsulated and preserved, it becomes a fossil, therefore turning into evidence of things that once lived（）.

A．thereby
B．as a result of
C．so
D．in the end