Everyday Mary types on the computer, but today she _______ a typewriter because there is no power.
Giải chi tiết:
- Dấu hiệu: “but today”: nhưng hôm nay (nhấn mạnh vào hành động ngắn, chỉ xảy ra vào hôm nay)
- Cách dùng: Thì hiện tại tiếp diễn dùng để diễn tả một sự việc đang diễn ra tại thời điểm nói.
- Công thức: S + are/ is/ am + V_ing
Tạm dịch: Mọi ngày, Mary đánh chữ trên máy tính, nhưng hôm nay cô ấy đang sử dụng máy đánh chữ bởi vì mất điện.
Chọn B
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