问题
选择题
My grandparents are used to _________their house at 6 in the morning to have a walk every day. [ ]
A. leave
B. leaving
C. be leaving
D. left
答案
答案：B
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My grandparents are used to _________their house at 6 in the morning to have a walk every day. [ ]
A. leave
B. leaving
C. be leaving
D. left
答案：B