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
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单项选择题
They have the competence to take this job.
A. possibility
B. reality
C. capacity
D. probability
单项选择题
A great deal has been done to better the situation.
A. change
B. improve
C. assess
D. harm
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