Choose the best answer.My father is busy ________ my bike.
A. to fix
B. fix
C. fixing
D. fixed
Đáp án: C
Giải thích: Cấu trúc: tobe busy doing something: bận rộn làm việc gì
=> My father is busy fixing my bike.
Tạm dịch: Cha tôi đang bận rộn sửa chiếc xe đạp của tôi.
Đáp án cần chọn là: C
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