单项选择题

We must take part in physical labor in order to ______ ourselves more closely with the working people.

A. identify
B. incorporate
C. combine
D. involve
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单项选择题
The ______ crown jewels are kept in the Tower of London.
A. valued
B. valueless
C. invaluable
D. usable
单项选择题
Many automobile accidents were ______ careless driving.
A. attributed to
B. resulted in
C. contributed to
D. raised from
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