单项选择题

The little boy was sad because he had made a big mistake.

A. large
B. serious
C. good
D. bad
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单项选择题
That is the only key to the question asked by the teacher.
A. problem
B. mistake
C. result
D. answer
单项选择题
They can put up with the poor living condition.
A. bear
B. accept
C. support
D. refuse
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