问题
选择题
The problem is very hard. He thought of it for a long time._______ he solved it． [ ]
A. In the end
B. At the end of
C. by the end of
D. In the end of
答案
答案：A
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The problem is very hard. He thought of it for a long time._______ he solved it． [ ]
A. In the end
B. At the end of
C. by the end of
D. In the end of
答案：A