单项选择题

Dr. Krugman believes that when we stop noticing ads, we begin to （）

A．like them
B．be on guard against them
C．accept them
D．dislike them

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单项选择题

A．reason
B．for
C．because
D．since

单项选择题

The office duties used to be（）

A．difficult
B．boring
C．heavy
D．appealing

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