问题补充：
I to think their jobs were .
A. used; bored
B. am used; boring
C. am used; bored
D. used; boring
答案：
A. used; bored
B. am used; boring
C. am used; bored
(答案→)D. used; boring
解析：be used to sth习惯于某事;used to do sth过去常常做某事. sth be used to do sth某物被用来做某事。句意：我过去常常认为他们的工作很无聊。Bored无聊的，厌烦的，指人；boring，无聊的，令人感到厌烦的，指物。结合语境可知前文指的是过去常做的动作，下文指的是他们的工作的性质，故选D。
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