单项选择题
All that can be done ______.
A. have been done
B. has been done
C. have done
D. has done
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单项选择题
After coming a long way from the valley, the little boy was rired and ______.
A. kind
B. excited
C. weak
D. lively
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单项选择题
He tried various jobs and ______ became an editor.
A. at the end
B. on the end
C. to the end
D. in the end
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