单项选择题

They ______ the work in spite of the extremely difficult conditions.

A) carried on
B) carried off
C) carried out
D) carried forward
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单项选择题
The old lady has ______ two wars and revolutions.
A) lived on
B) lived through
C) lived up
D) lived with
单项选择题
I am still unable to make myself ______ in the discussion, which worries me a lot.
A) to be understood
B) understanding
C) understood
D) understand
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