Volunteers games and activities with disadvantaged children while they for the center

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Choose the best answer

Volunteers ______ games and ______ activities with disadvantaged children while they ______ for the center.

played - had - worked

were having - having - were working

have played - playing - are working

played - had - were working

Giải thích

S + V (QKĐ) while S + V ( QKTD): 1 hành động đang diễn ra trong quá khứ thì hành động khác chen vào.

=>Volunteers played games and had activities with disadvantaged children while they were working for the center.

Tạm dịch: Tình nguyện viên đã chơi trò chơi và tổ chức các hoạt động cho trẻ em khuyết tật khi họ đang làm việc ở trung tâm.

Đáp án cần chọn là: D