He goes swimming when he ____ free time.
A. have
B. is having
C. has
D. will have
Giải bởi Vietjack
Vế trước chia ở thì hiện tại đơn => vế sau cũng chia ở thì hiện tại đơn (tương ứng về thì)
=> Loại B (hiện tại tiếp diễn) và D (tương lai đơn)
Chủ ngữ số ít (he, anh ấy) => động từ thêm –s/es
=> He goes swimming when he has free time.
Tạm dịch: Anh ấy đi bơi khi có thời gian rảnh.
Đáp án cần chọn là: C
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