单项选择题

When I finished the story, Lenin jumped from his chair and started to pace the floor, （）, deep in thought.

A. with his head bending
B. his head bending
C. his head bent
D. bending his head

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问答题

In a society of such high moral practice, what need is there for people to be on guard against others

单项选择题

A.at
B.with
C.by
D.through