单项选择题

I went along thinking of nothing ______, only looking at things around me.

A. in particular
B. in harmony
C. in doubt
D. in brief
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单项选择题
It may be necessary to stop ______ in the learning process and go back to the difficult points in the lessons.
A. at a distance
B. at intervals
C. at case
D. at length
单项选择题
The lecture which lasted about three hours was so （）that the audience couldn’t help yawning.

A. tedious
B. bored
C. clumsy
D. tired
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