单项选择题

Our failure______ourselves to modern life often causes us trouble in our work.

A. to adopt
B. to apply
C. to adapt
D. to act
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单项选择题
Once（）of the necessity of a move，he worked hard to find a new home.

A. convinced
B. be convinced
C. convincing
D. having convinced
单项选择题
So many representatives______, the conference had to be put off.
A. were absent
B. to be absent
C. being absent
D. had been absent
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