问题
选择题
Part of the family are out on holiday. They are supposed to be back ______ this week. [ ]
A. in the end of
B. at the end of
C. by the end of
D. for the end of
答案
答案：B
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Part of the family are out on holiday. They are supposed to be back ______ this week. [ ]
A. in the end of
B. at the end of
C. by the end of
D. for the end of
答案：B